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Question

A magnetic field exerts no force on
  1. a stream on protons
  2. a stream of electrons
  3. unmagnetised piece of iron
  4. stationary charge.

A
stationary charge.
B
a stream of electrons
C
unmagnetised piece of iron
D
a stream on protons
Solution
Verified by Toppr

The correct option is D stationary charge.
F=q(v×B)
if v=0F=0

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