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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
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- 2.0 cm
- 0.5 cm
- 4.0 cm
- 1.0 cm
Correct Option: C
| r = | or r ∝ v | |
| qB |
As v is doubled, the radius also becomes double. Hence, radius = 2 × 2 = 4 cm
