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>>Moving Charges and Magnetism
>>Motion of a Charge in Magnetic Field
>> $Assertion: If an electron is not deflect$

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.

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

Assertion is false but reason is true

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Updated on : 2022-09-05

Solution

Verified by Toppr

Correct option is D)

$\overline{F} = q (\overline{v} \times \overline{B})$
$F = q v B sin θ$
if $θ = 0$ , $F = 0$
then particle will also not deflect.
And $F α B$

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