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IIT JAM Physics Mock Test - 6 - Physics MCQ


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30 Questions MCQ Test IIT JAM Physics Mock Test Series 2025 - IIT JAM Physics Mock Test - 6

IIT JAM Physics Mock Test - 6 for Physics 2024 is part of IIT JAM Physics Mock Test Series 2025 preparation. The IIT JAM Physics Mock Test - 6 questions and answers have been prepared according to the Physics exam syllabus.The IIT JAM Physics Mock Test - 6 MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for IIT JAM Physics Mock Test - 6 below.
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IIT JAM Physics Mock Test - 6 - Question 1

Two equally charged identical metal spheres A and B repel each other with a force 2 * 10-5 N. Another identical uncharged sphere C is touched to B and then placed at the mid point between A and B. The net electric force on C is ______ .

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 1


As the sphere C is touched to sphere B ; the charge on B & C will be distributed equally.

IIT JAM Physics Mock Test - 6 - Question 2

A point charge q sits at a corner of a cube of side a, as shown in the figure on the right, the flux of the electric field vector through the shaded side is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 2

When a charge is situated at the corner of any face, then its contribution at the centre of cubic is 1/4 q

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IIT JAM Physics Mock Test - 6 - Question 3

The electric flux crossing the wire frame ABCD of length l width b and whose centre is at a distance OP = d from an infinite line of charge with linear charge density λ consider that the plane of frame is perpendicular to line OP is ______ .

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 3



IIT JAM Physics Mock Test - 6 - Question 4

The electric potential in a region is represented as v = 2x + 3y -z, obtain expression for the electric field strength?

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 4

IIT JAM Physics Mock Test - 6 - Question 5

A uniform dielectric ball is placed in a uniform electric field of strength  under these conditions the dielectric becomes polarized uniformly. The electric field strength  inside the ball is ____. 

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 5

IIT JAM Physics Mock Test - 6 - Question 6

A parallel plate air capacitor is made using two square plates each of side 0.2m, spaced 1 cm apart. It is connected to a 50 V battery. What is the energy stored in the capacitor?

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 6

IIT JAM Physics Mock Test - 6 - Question 7

A particle of positive charge Q = Ze where, Z is an integer is having a fixed position P. Another charged particle of mass m and charge e moves at a constant speed in a circle of radius r1, with centre at P. Find the work that must be done to increase the radius of circle to r2.

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 7

Let q orbit round Q in a circle of radius r 
K.E. of orbiting particle = 1/2 mv2


Now total energy of q when in orbit of radius r1

When it is in orbit of radius r2

The workdone on q = charge in energy

IIT JAM Physics Mock Test - 6 - Question 8

A plane electromagnetic wave travelling in a vacuum is characterized by the electric and magnetic fields

It ω and k are positive, then the value of H0 must be

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 8

for electromagnetic wave

Here   having same phase and moving perpendicular to each other

IIT JAM Physics Mock Test - 6 - Question 9

Consider two charges +Q and -Q placed at the points (a.O) and (-a.O) in a plane, as shown is the figure on the right. If the origin is moved to the point (x.y). the magnitude of the dipole moment of the given charge distribution with respect to this origin will be

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 9

When origin is shifted at 0(x,y) point, then potential and Electric field will be changed. But dipole moment is the multiple charge on dipole and their separation, which not change in that condition.

IIT JAM Physics Mock Test - 6 - Question 10

Two concentric coplanar semicircular conductors from part of two current loops as shown in figure. If there radii are 11 cm and 4 cm. The magnetic induction at the centre is (in 10-5 wb/m2)

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 10


Magnetic field at the centre of a circular coil = 
magnetic field at the centre due to wire 
Total magnetic field at the centre = 


Putting values

IIT JAM Physics Mock Test - 6 - Question 11

A long straight conductor is bent at angle of 900 as shown in the figure. The magnetic field induction at A is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 11


IIT JAM Physics Mock Test - 6 - Question 12

A beam of protons with a velocity 4 x 105 m/sec. Enters a uniform magnetic field of 0.3 T at an angle 600 to the magnetic field. The pitch of helix is?

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 12

Pitch of the helix = (VII) (timeperiod)

Putting values we get;
Pitch 

IIT JAM Physics Mock Test - 6 - Question 13

An a.c. voltage source is connected across a parallel plate capacitor. The value of displacement current is —

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 13

let the a.c. voltage source connected across the plates o b a capacitor is 

The capacity of a parallel plate capacitor with an area b. section A and plate separation d is

Electric field E in the dielectric medium between plate is

IIT JAM Physics Mock Test - 6 - Question 14

If the earth receives 2 cal min-1 cm-2 solar energy. The amplitude of magnetic fields of radiation is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 14

Poynting vector  as

The energy per unit area per second is

IIT JAM Physics Mock Test - 6 - Question 15

The magnetic field associated with the electric field vector  is given by

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 15


IIT JAM Physics Mock Test - 6 - Question 16

The current flowing in a coil of self-inductance L is given by  ampere. where a and A are constants. The potential difference between the ends of the coil will be:

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 16

IIT JAM Physics Mock Test - 6 - Question 17

Solving Poisson's equation  for the electrostatic potential  in a region with a constant charge density  two students find different answers. 

The reason why these different solutions are both correct is because

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 17

We know that the poission's equation is

If a potential function  satisfied the Laplace equation  then
If means that the given potential function will exist in a charge less system. If not. then it will satisfies the poission's equation and we can calculate the charge density (ρ)
The given function are

But the boundary conditions are different in both cases. The boundary condition are along to x-axis. But one function satisfies by the Laplace's eq. and one function satisfies by the Poisson's eq. so we cannot add both solutions.

IIT JAM Physics Mock Test - 6 - Question 18

An electric dipole is constructed by fixing two circular charged rings, each of radius a, with an insulating contact (see figure). One of these rings has total charge +Q and the other has total charge -Q. If the charge is distributed uniformly along each ring, the dipole moment about the point of contact will be

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 18

We will consider this two rings as point charges (because the charge is distributed uniformly on them) placed at the centre of these rings, so, we have dipole moment 

IIT JAM Physics Mock Test - 6 - Question 19

The field potential in a certain region of space depends only on the x coordinate as  where a and b are constants.
Then charge density ρ(x) is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 19


 ...(i)
from gauss theorem
 ...(ii)
dq is charge contained between the sphere of radii x and x + dx.

 ...(iii)
So, from eq. (1)(2) and (3)

IIT JAM Physics Mock Test - 6 - Question 20

Charge is distributed uniformly throughout the long non-conducting cylinder of radius R. Which one of the following graphs best represents the magnitude of the resulting electric field E as a function of r, the distance from the axis of the cylinder?

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 20





IIT JAM Physics Mock Test - 6 - Question 21

The total potential due to an electric dipole "p" placed at the origin is known to be the form f(r)  The total flux of the electric field through a spherical surface of radius 'R' with the dipole at the centre is given by :-

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 21

Total flux = 0  → ( As Qnet inside the surface is zero)

IIT JAM Physics Mock Test - 6 - Question 22

In the following circuit, the AC source is an ideal voltage source. What is the amplitude of the  steady state current through the inductor at resonance

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 22

IIT JAM Physics Mock Test - 6 - Question 23

The capacitance of a cylindrical capacitor whose is comprised of two cylindrical  shells of radius r1 & r2 length (I) is (r1 < r2)

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IIT JAM Physics Mock Test - 6 - Question 24

An infinitely long hollow cylinder of radius a carrying a surface change density σ is rotated about its cylindrical axis with a constant angular speed ω. Then the magnitude of vector potential outside the cylinder at a distance r from its axis is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 24

Surface current 

Magnetic field inside is 


IIT JAM Physics Mock Test - 6 - Question 25

The electric and magnetic fields in the space are
 being unit vectors in x and y directions respectively. The Poynting vector in this region is

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 25

The rate of transmission of electromagnetic energy per unit area through a plane perpendicular to the direction of propagation of the electromagnetic waves is known as poynting vector denoted by letter and is given as
E = E X H ...(i)
where  ...(ii)
and 
⇒  ...(iii)

IIT JAM Physics Mock Test - 6 - Question 26

A plane electromagnetic wave has the magnetic field given by

where k is the wave number and  are the Cartesian unit vectors in X, Y and Z-directions, respectively.
Then, the electric field  corresponding to the above wave, is given by

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 26


IIT JAM Physics Mock Test - 6 - Question 27

If points in x- direction and points in Z-direction. and a particle of mass m and charge Q at rest is released from origin, then particle will follow cycloidal path. Which of the following coupled differential equation represents cycloidal path ( where )

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IIT JAM Physics Mock Test - 6 - Question 28

A thin conducting wire is bent into a circular loop of radius r and placed in a time-dependent magnetic field of magnetic induction  Such that the plane of loop is perpendicular to  Then the induced emf in the loop is

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IIT JAM Physics Mock Test - 6 - Question 29

If at t = 0. the charge density in a medium having conductivity σ and permittivity ε is  then the charge density  at any later time t is given by

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 29

equation of continuity is

IIT JAM Physics Mock Test - 6 - Question 30

A plane electromagnetic wave has the magnetic field given by

where k is the wave number and are the Cartesian unit vectors in x, y and z directions, respectively, then the corresponding electric field is given by

Detailed Solution for IIT JAM Physics Mock Test - 6 - Question 30

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