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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

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

The correct option is B Assertion is false but reason is true
¯¯¯¯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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