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Q.

A charged particle of mass 10-3 kg and charge 10-5 C enters a magnetic field of induction 1T. If g= 10 ms-2, for what value of velocity will it pass straight through the field without deflection?

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a

103 ms-1

b

1ms-1

c

10-3 ms-1

d

10-6ms-1

answer is B.

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Detailed Solution

Since the charged particle passes straight without deflection, therefore

BqV = mg

 or   v=mgBq=10-3×101×10-5=103 ms-1

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