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Assertion (A): An electron and a proton ...

Assertion (A): An electron and a proton moving with same velocity enters a magnetic field. The force experienced by the proton is more than the force experienced by the electron.
Reason (R): The mass of proton is more than the mass of the electron.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true but R is NOT the correct explanation of A

C

A is true but R is false

D

A is false and R is true

Text Solution

Verified by Experts

The correct Answer is:
D
`vecF = q (vecupsilon xx vecB)`
So, the force is mass independent. So, the assertion is false.
Proton is obviously heavier than electron. So, reason is true. But reason does not explain the assertion.
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Knowledge Check

  • The ratio of the mass of the proton to the mass of the electron is

    A
    920
    B
    1840
    C
    3680
    D
    4810

  • Assertion : An electron and proton enters a magnetic field with equal velocities, then, the force experienced by the proton will be more than electron. Reason : The mass of proton is 1837 times more than electron.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • If an electron and a proton having same momenta enter perpendicular to a magnetic field, then

    A
    curved path of electron and proton will be same ( ignoring the sense of revolution)
    B
    they will move undeflected
    C
    curved path of electron is more curved than that of the proton
    D
    path of proton is more curved.

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