Question

A proton describes a circular path of radius 5 cm in a transverse magnetic field. If the speed of proton is doubled, then the radius of the circular path will be ____________.

Options

• 7.5 cm

• 2.5 cm

• 5 cm

• 10 cm

Answer 1

A proton describes a circular path of radius 5 cm in a transverse magnetic field. If the speed of proton is doubled, then the radius of the circular path will be 10 cm.

Explanation:

`"Radius r" = "mv"/"qB"`

If speed v is doubled, radius will also double.

∴ New radius = 2 x 5 = 10 cm