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Question

A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is :

A
Away from the wire
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B
Parallel to the wire along the current
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C
Towards the wire
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D
Parallel to the wire opposite to the current
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Solution

The correct option is A Towards the wire
Magnetic field at A out of the plane of the paper
B=B0^k
force on charged particle:
F=qv×B
F=+qvB0^j
Therefore, the particle moves towards the wire.

667771_629684_ans_8702b4088b2c4ae49e6bb380eac90b1b.png

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