Q.

A particle of charge q and mass m is moving along the x-axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figures below. For which figure the net force on the charge may be zero?

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a

b

c

d

answer is B.

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Detailed Solution

The charge will not experience any force if F→e =  F→m. This condition is satisfied in option (b) only as v→,  E→ and B→ are mutually perpendicularly to each other.
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