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Question

If a charged particle projected in a gravity-free room deflects
  1. there must be an electric field
  2. there must be a magnetic field
  3. both fields cannot be zero
  4. both fields can be non-zero

A
there must be a magnetic field
B
both fields cannot be zero
C
there must be an electric field
D
both fields can be non-zero
Solution
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If a charged particle projected in a gravity-free room deflects i.e. some force is acting on the particle, hence both fields cannot be zero both fields can be non-zero

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