EWT | Academic Question

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Question (1)
QN0039052

Through two parallel wires  and  and  of currents are passed respectively in opposite directions. If the wire  is infinitely long and the length of the wire  is , then force on the conductor , which is situated at  distance from , will be

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: B
Explanation:

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Question (2)
QN0039053

A wire  of length  carrying a current of  is placed parallel to along wire  of length . The wire  carries a current of . The distance between two wires is  and currents flow in the same direction. The force acting on the wire  is :                                                                                                                                        

  • (A)

    directed towards wire .

  • (B)

    directed away from wire .

  • (C)

    directed towards wire .

  • (D)

    directed towards wire .

Correct Answer: A
Explanation:

Given, length of wire  Length of wire

Distance between two wire,

Force of interaction

towards

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Question (3)
QN0039054

Two straight long conductors  and  are perpendicular to each other and carry currents  and . The magnitude of the magnetic induction at a point  at a distance a from the point  in a direction perpendicular to the plane  is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

The point  is lying symmetrically w.r.t. the two long straight current carrying conductors. The magnetic fields at  due to these current carrying conductors are mutually perpendicular.

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Question (4)
QN0039055

Two long parallel wires  and  are held perpendicular to the plane of paper with distance of  between them. If  and  carry current of . and . respectively in the same direction, then the magnetic field at a point halfway between the wires is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

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Question (5)
QN0039056

Two thin, long, parallel wires, separated by a distance '  ' carry a current of '  '  in the same direction. They will

  • (A)

    repel each other with a force of 

  • (B)

    attract each other with a force of 

  • (C)

    repel each other with a force of 

  • (D)

    attract each other with a force of 

Correct Answer: B
Explanation:

(attractive as current is in the same direction)

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Question (6)
QN0039057

A triangular shaped wire carrying  current is placed in a uniform magnetic field of , as shown in figure. The magnetic force on segment  is (Given  )                                            

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

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Question (7)
QN0039058

Three wires are situated at the same distance. A current of  flows through these wires in the same direction. What is ratio of , where  is force on 1 and  on 2? 

  • (A)

  • (B)

  • (C)

    1

  • (D)

    None of these

Correct Answer: B
Explanation:

Due to flow of current in same direction at adjacent side, an attractive magnetic force will be produced.

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Question (8)
QN0039059

Three infinitely long parallel straight current carrying wires  and  are kept at equal distance from each other as shown in the figure. The wire  experiences net force . The net force on wire , when the current in wire  is reversed will be

  • (A)

    Zero

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

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Question (9)
QN0039060

Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases which type of force acts between the two wires?

  • (A)

    Attraction force when in parallel and repulsion force when in series

  • (B)

    Repulsion force when in parallel and attraction force when in series

  • (C)

    Repulsion force in both cases

  • (D)

    Attraction force in both cases

Correct Answer: A
Explanation:

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Question (10)
QN0039061

If a current is passed through a spring then the spring will

  • (A)

    expand

  • (B)

    compress

  • (C)

    remains same

  • (D)

    none of these

Correct Answer: B
Explanation:

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