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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

An alternating electric field, of frequency , is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by [CBSE PMT (Prelims) 2012]

Answer: (C)

Solution

Resonance requires , so ; the final speed is , so \tfrac$12

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Question ID VK-078745