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

1. 2.0 cm
2. 0.5 cm
3. 4.0 cm
4. 1.0 cm

Correct answer: 4.0 cm

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