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This mock test of QUIZ 4:torque On A Current Carying Wire(#freetestseries) for JEE helps you for every JEE entrance exam.
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QUESTION: 1

Two free parallel wires carrying currents in opposite direction [CPMT 1977; MP PMT 1993; AFMC 2002; CPMT 2003]

Solution:

Two wires, if carries current in opposite direction, they repel each other.

QUESTION: 2

A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will

[IIT 1985; MP PET 1995; MP PMT 1995, 99; AIIMS 2003]

Solution:

QUESTION: 3

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m^{2}. The magnetic dipole moment of the coil is [MP PMT 2001]

Solution:

QUESTION: 4

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B−→, such that B−→ is perpendicular to the plane of the loop. The magnetic force acting on the loop is [BIT 1992; MP PET 1994; IIT 1983; MP PMT 1999; AMU (Engg.) 2000]

Solution:

Net force on a current carrying closed loop is always zero, if it is placed in an uniform magnetic field.

QUESTION: 5

Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is [CPMT 1991; IIT 1986; Bihar MEE 1995; RPMT 1997; MP PET 1996; MP PMT 1994, 96, 99; UPSEAT 2001, 03]

Solution:

QUESTION: 6

Through two parallel wires A and B, 10 and 2 ampere of currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2 m, the force on the conductor B, which is situated at 10 cm distance from A will be [CPMT 1988; MP PMT 1994]

Solution:

QUESTION: 7

If two streams of protons move parallel to each other in the same direction, then they [MP PET 1999; AIIMS 2004]

Solution:

For charge particles, if they are moving freely in space, electrostatic force is dominant over magnetic force between them. Hence due to electric force they repel each other.

QUESTION: 8

Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be [CPMT 1977]

Solution:

QUESTION: 9

Two straight parallel wires, both carrying 10 ampere in the same direction attract each other with a force of 1×10−3N. If both currents are doubled, the force of attraction will be [MP PET 1994]

Solution:

QUESTION: 10

A circular coil of radius 4 cm has 50 turns. In this coil a current of 2 A is flowing. It is placed in a magnetic field of 0.1 weber/m^{2}. The amount of work done in rotating it through 180° from its equilibrium position will be [CPMT 1977]

Solution:

QUESTION: 11

3 A of current is flowing in a linear conductor having a length of 40 cm. The conductor is placed in a magnetic field of strength 500 gauss and makes an angle of 30∘ with the direction of the field. It experiences a force of magnitude [MP PET 1993]

Solution:

QUESTION: 12

A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon [CPMT 1985; RPMT 1997; Kerala PMT 2002]

Solution:

- Because
τ=NiABcosθ

QUESTION: 13

To make the field radial in a moving coil galvanometer [MP PET 1993]

Solution:

QUESTION: 14

The deflection in a moving coil galvanometer is [MP PMT 1993]

Solution:

QUESTION: 15

In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation [MP PMT 1996, 2000, 03; RPMT 1997; CPMT 1975; MP PET 1999]

Solution:

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