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Question

A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity V, as shown, the force on the charge is:
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A
Along ox
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B
Opposite to oy
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C
Along oy
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D
Opposite to ox
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Solution

The correct option is A Along oy
F=q(v×B)=qvB(^i×(^k))=qvB^j
force on the charge is along OY

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