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An electron having mass 9.1xx10^(-31)kg,...

An electron having mass `9.1xx10^(-31)`kg, charge `1.6xx10^(-19)C` and moving with the velocity of `10^(6)m//s` enters a region where magnetic field exists. If it describes a circle of radius 0.2 m then the intensity of magnetic field must be _______ `xx10^(-5)T`.

A

14.4

B

5.65

C

2.84

D

1.32

Text Solution

Verified by Experts

The correct Answer is:
C
`R= (mv)/(qB) implies B= (mv)/(qR)`
`B= (9,1 xx 10^(-31) xx 10^(6))/(1.6 xx 10^(-19) xx 0.2)= (9.1)/(1.6 xx 2) xx 10^(-6)= 2.84 xx 10^(-6) T`
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