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MHT CET 2022 Physics question

PhysicsMoving Charges and MagnetismMHT CET 2022

A proton moving in perpendicular magnetic field possesses energy 'E'. The strength of magnetic field is increased four times. But the proton is constrained to move in the path of same radius. The kinetic energy of proton will increase

Answer: (D)

Solution

For circular motion in a magnetic field , so for a fixed radius . Kinetic energy . When becomes , the speed becomes

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Question ID VK-093928