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Moving Charges and Magnetism(6 Dec) - JEE MCQ


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15 Questions MCQ Test Daily Test for JEE Preparation - 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
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 4
Since currents in the wires are flowing in opposite directions, the magnetic fields due to the wires at a point equidistant from the two wires will be equal and opposite. The net magnetic field at this point is zero. Hence the force on a charge at this point is zero.
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
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
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 7


Also
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

Magnetic force due to AB and CD is zero (∴θ = 0 or 180).

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


[use magnetic field at perpendicular bisector]

[only contribution is from straight wire −a to +a along z axis]

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
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 11
Because current in the loop is zero
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
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
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
Detailed Solution for Moving Charges and Magnetism(6 Dec) - Question 14
Use the Right hand palm rule or Maxwell's Cork screw rule.
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

If the loop current is coming out it should be taken as positive and if it is going in it is taken as negative.
is coming out and again going in so its net contribution will be zero.
According to Ampere's law,


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