Moving Charges and Magnetism(6 Dec) - JEE MCQ
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15 Questions MCQ Test - Moving Charges and Magnetism(6 Dec)
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Moving Charges and Magnetism(6 Dec) - Question 1
A circular loop of wire 
in radius carries a current of 
. Find the energy density at the centre of the loop.
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 1
and energy density 
Moving Charges and Magnetism(6 Dec) - Question 2
A wire along x-axis carries a current 3.5 A. Find the force on a 1 cm section of the wire exerted by 
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 2
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Moving Charges and Magnetism(6 Dec) - Question 3
Figure shows a circular wire of radius 
carrying a current 
. The force of compression on the wire is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 3
Moving Charges and Magnetism(6 Dec) - Question 4
Two very long straight parallel wires carry steady currents 
and 
. The distance between the wires is 
. At a certain instant of time, a point charge 
is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity 
is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
and . The distance between the wires is . At a certain instant of time, a point charge is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 4
Moving Charges and Magnetism(6 Dec) - Question 5
If a particle of charge 
coulomb moving along the 
-direction with a velocity 
experiences a force of 
newton in 
direction due to magnetic field, then the minimum magnetic field is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 5
Moving Charges and Magnetism(6 Dec) - Question 6
The magnetic induction at a point 
which is at a distance 
from a long current carrying wire is 
Tesla. The field of induction at a distance 
from the same current would be
which is at a distance from a long current carrying wire is Tesla. The field of induction at a distance from the same current would be
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 6
tesla
Moving Charges and Magnetism(6 Dec) - Question 7
An electron having charge 
and mass 
is moving with 
speed in a magnetic field 
tesla in a circular orbit. The force acting on electron and the radius of the circular orbit will be
and mass is moving with speed in a magnetic field tesla in a circular orbit. The force acting on electron and the radius of the circular orbit will be
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 7
Moving Charges and Magnetism(6 Dec) - Question 8
The figure shows an infinitely long current-carrying wire out of the plane of paper (shown by e). A current carrying loop 
is placed as shown. The loop
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 8
Moving Charges and Magnetism(6 Dec) - Question 9
A wire bent as shown in Fig is oriented along yz plane. Find the magnetic field at 
and 
, 
.
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 9
Moving Charges and Magnetism(6 Dec) - Question 10
A square loop of side 
is placed at a distance away from a long wire carrying a current 
. If the loop carries a current 
as shown in figure then the nature of the force and its amount is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 10
and 
cancel one another. 
is attractive, 
is repulsive. But 
Force is attractive
Moving Charges and Magnetism(6 Dec) - Question 11
In the figure shown below each battery has emf 
. Then the magnetic field at 
is
. Then the magnetic field at is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 11
Moving Charges and Magnetism(6 Dec) - Question 12
A square coil of edge 
having 
turns carries a current 
. It is placed on a smooth horizontal plate. A magnetic field 
parallel to one edge is applied. The total mass of the coil is 
. The minimum value of 
for which the coil will tip over is
having turns carries a current . It is placed on a smooth horizontal plate. A magnetic field parallel to one edge is applied. The total mass of the coil is . The minimum value of for which the coil will tip over is
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 12
or 
Moving Charges and Magnetism(6 Dec) - Question 13
A long solenoid has 200 turns per 
and carries a current of 
amps. The magnetic field at its centre is
weber/amp 
and carries a current of amps. The magnetic field at its centre is weber/amp
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 13
Moving Charges and Magnetism(6 Dec) - Question 14
A wire carrying current 'i' is shaped as shown. Section 
is a quarter circle of radius 
. The magnetic field is directed
is a quarter circle of radius . The magnetic field is directed
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 14
Moving Charges and Magnetism(6 Dec) - Question 15
Figure shows an amperian path 
. Part 
is in vertical plane 
while part 
is in horizontal plane 
. Direction of circulation along the path is shown by an arrow near point 
and at 
. 
for this path according to Ampere's law will be
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 15
is coming out and again going in so its net contribution will be zero.
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