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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 $$\underset{V}{\rightarrow}$$, 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
$$\vec{F}=q(\vec{v}\times \vec{B})=qvB(\hat{i}\times (-\hat{k}))=qvB\hat{j}$$
$$\Rightarrow$$ force on the charge is along OY

Physics
NCERT
Standard XII

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