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Assertion: The energy of charged particl...

Assertion: The energy of charged particle moving in uniform magnetic field does not change.
Reason: Work done by magnetic field on the charge is zero.

A

If both the assertion and reason are true and reason is a true explantion of the assertion.

B

If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.

C

If the assertion is true but reason false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
The force on a charged particle moving in a uniform magnetic field always acts in direction perpendicular to the direction of motion of the charge. As work done by magnetic field on the charge is zero, `[W=FS cos theta]`, so the energy of the charged particle does not change.
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Knowledge Check

  • Assertion (A): The energy of a charged particle moving in a uniform magnetic field remains constant. Reasoning (R): Work done by the magnetic field on the charge is zero.

    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

  • A particle is moving in a uniform magnetic field, then

    A
    Its momentum changes but total energy remains the same
    B
    Both momentum and total energy remain the same
    C
    Both will change
    D
    Total energy changes but momentum remains the same

  • Work done by a magnetic field on moving charge is:

    A
    1
    B
    0
    C
    infinite
    D
    Magnetic field is 'independent of charge

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