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 FαB