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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 $$\rightarrow$$ out of the plane of the paper
$$B={ B }_{ 0 }\hat { k }$$
$$\Rightarrow$$ force on charged particle:
$$\Rightarrow F=-q\vec { v } \times \vec { B } $$
$$\Rightarrow F=+qv{ B }_{ 0 }\hat { j } $$
Therefore, the particle moves towards the wire.

667771_629684_ans_8702b4088b2c4ae49e6bb380eac90b1b.png

Physics

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