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Question

When an electron moves through a magnetic field, its speed will
  1. decrease.
  2. increase.
  3. remain the same.
  4. increase first and then decrease.

A
remain the same.
B
decrease.
C
increase.
D
increase first and then decrease.
Solution
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The work done by magnetic force on any moving charge particle is zero because magnetic force acts perpendicular to the direction of motion. Therefore speed will remain same.

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