Question

which of the following quantities related to a free positively charged alpha particle can change in a uniform magnetic field?
A) mass
B) speed
C) momentum
D) kinetic energy​

Answer 1

Answer:

D) kinetic energy​

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Answer 2

Charge particle can change momentum but not kinetic energy when enter in a uniform magnetic field.

Explanation:

• Option c is the answer of this question

• When magnetic force is applied perpendicularly to the proton motion direction, work done will become zero ,As force acting perpendicularly to the direction

• Only direction could be changed but not the magnitude which cause it to change only momentum but not kinetic energy

• So magnetic field perpendicular to particle change the direction only.