Question

Cathode rays moving with same velocity ???? describe an
approximate circular path of radius ???? metre in an electric field of
strength x volt metre⁻¹. If the speed of the cathode rays is
doubled to 2v, the value of electric field needed so that the rays
describe the same approximate circular path (volt metre⁻¹) is
(a) 2x (b) 3x
(c) 4x (d) 6x

Answer 1

Explanation:

option d is correct ...

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