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Physics
Assertion: Magnetic field can not change kinetic energy of a moving charge. Reason: Magnetic field can not change velocity vector.
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Q.
Assertion :
Magnetic field can not change kinetic energy of a moving charge.
Reason :
Magnetic field can not change velocity vector.
AIIMS
AIIMS 2018
Moving Charges and Magnetism
A
If both assertion and reason are true and reason is the correct explanation of assertion
26%
B
If both assertion and reason are true but reason is not the correct explanation of assertion
22%
C
If assertion is true but reason is false
33%
D
If both assertion and reason are false
18%
Solution:
Magnetic force on moving charge is always perpendicular to its velocity.
$\vec{F}=q\left(\vec{ v}\times\vec{B}\right)$
Also, work done by magnetic force on a moving charge is zero.