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Grade upto college level Magnetism

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

(a) 2.0 cm

(b) 0.5 cm

(c) 4.0 cm

(d) 1.0 cm

Profile image of Amit Saxena
12 Years agoGrade upto college level
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1 Answer

Profile image of Navjyot Kalra
12 Years ago

(c)

 As v is doubled, the radius also becomes double.

Hence radius = 2 × 2 = 4 cm