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# 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 regionReason: Magnetic force is directly proportional to magnetic field appliedAssertion is true but reason is falseAssertion is false but reason is trueBoth assertion and reason are true and reason is correct explanation of the assertion.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
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#### ¯¯¯¯F=q(¯¯¯v×¯¯¯¯B)F=qvBsinθif θ=0, F=0then particle will also not deflect.And F α B

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Q1
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

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Q2
(i)
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