A uniform magnetic field acts at right angles to the direction

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A uniform magnetic field acts at right angles to the direction

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

r = mv or r ∝ v
qB

As v is doubled, the radius also becomes double. Hence, radius = 2 × 2 = 4 cm