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:

A
Along ox
B
Opposite to oy
C
Along oy
D
Opposite to ox

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 OYPhysicsNCERTStandard XII

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