Magnetic Force on a Current Carrying Wire - MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Magnetic Force on a Current Carrying Wire.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. Two long conductors, separated by a distance d carry current i1 and i2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d. The new value of the force between them is

•  -2F/3
•  F/3
•  -2F
•  -F/3

-2F/3

Q2. Two parallel beams of positrons moving in the same direction will

•  Repel each other
•  Will not interact with each other
•  Attract each other
•  Be deflected normal to the plane containing the two beams

Repel each other

Q3. When two wires have current in same direction then force is

•  Attractive
•  Repulsive
•  Both
•  Can't be determined

Attractive

Q4. The current is flowing in opposite directions under magnetic field in two long parallel wires then

•  Both the wires will attract each other
•  Both the wires will repell each other
•  Both the wires will move perpendicular to each other
•  None of these

Both the wires will repell each other

Q5. 1.2 amp current is flowing in a wire of 0.3 m length, It is placed perpendicular to the magnetic field (identical to 2T). The force acting on the wire will be

•  1N
•  0.72N
•  0
•  2N

0.72N

Q6. If a current is passed through a spring then the spring will

•  Expand
•  Compress
•  Remains same
•  None of these

Compress

Q7. Two identical circular loops of metal wire are lying on a table. Loop A carries a current which increases with time. In response, the loop B

•  Is attracted by the loop A
•  Is repelled by the loop A
•  Remains stationary
•  None of the above

Is repelled by the loop A

Q8. Two long straight parallel conductors separated by a distance of 0.5 m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is

•  1.6 X 10-5N (attractive)
•  1.6 X 10-5N (repulsive)
•  16 X 10-5N (attractive)
•  16 X 10-5N (repulsive)

1.6 X 10-5N (attractive)

Q9. One ampere is that current flowing in two infinite long parallel wires placed at a distance on one meter produces between them a force of

•  1 N/m
•  2 X 107 N/m
•  2 X 10-7 N/m
•  3 X 10-7 N/m

2 X 10-7 N/m

Q10. A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right. then what will be the effect on electron stream

•  The electron stream will be pulled upward
•  The electron stream will be pulled downward
•  The electron stream will be retarted
•  The electron beam will be speeded up towards the right

The electron stream will be pulled downward

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