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A uniform magnetic field acts right angl...

A uniform magnetic field acts right angles to the direction of motion of electrones. As a result, the electron moves in acircular path of radius 2 cm. If the speed of electrons is doubled, then the radius of the circular path will be

A

2.0 c m

B

0.5 cm

C

4.0 cm

D

1.0 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Since , `r = (mv)/(qB) implies r prop v implies (r_(1))/(r_(2)) = (v_(1))/(v_(2)) , r_(2) = 4` cm
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