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
B
Parallel to the wire along the current
C
Towards the wire
D
Parallel to the wire opposite to the current

Solution

## The correct option is A Towards the wireMagnetic 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.Physics

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