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Question

Assertion: If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic field in this region

Reason: Magnetic force is directly proportional to magnetic field applied

  1. Assertion is true but reason is false
  2. Assertion is false but reason is true
  3. Both assertion and reason are true and reason is correct explanation of the assertion.
  4. Both assertion and reason are true and reason is not a correct explanation of the assertion.

A
Assertion is false but reason is true
B
Both assertion and reason are true and reason is not a correct explanation of the assertion.
C
Assertion is true but reason is false
D
Both assertion and reason are true and reason is correct explanation of the assertion.
Solution
Verified by Toppr

¯¯¯¯F=q(¯¯¯vׯ¯¯¯B)
F=qvBsinθ
if θ=0, F=0
then particle will also not deflect.
And F α B

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