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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

2.0cm

B

0.5cm

C

4.0 cm

D

1.0 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Radius of the circular path in which electron is moving will be, `r= (mv)/(qB) or r prop v`.
As v is double the radius also becomes doubled. Hence radius `=2 xx 2= 4cm`
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