In case of motion of a charged particle in a steady magnetic field :

Speed remains constant

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Momentum remains constant

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Kinetic energy remains constant

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Work done is always zero

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Solution

The correct options are
A Speed remains constant
B Work done is always zero
D Kinetic energy remains constant
Since the direction of magnetic force will always be perpendicular to velocity ,So Speed remains same ,it only changes direction . Speed is constant ko KE will remain same. Since the displacement and force are perpendicular, workdone will be zero.

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