Question 151: Magnetism and Matter

Question

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In an uniform magnetic field, speed and energy remains the same for a moving charged particle.
Reason (R) : Moving charged particle experiences magnetic force perpendicular to its direction of motion.

Accepted Answer

Magnetic force $$\overrightarrow F  \bot \overrightarrow v $$
$$ \Rightarrow {W_b} = 0$$
$$ \Rightarrow \Delta KE = 0$$ and speed remains constant.

Answer

Both (A) and (R) are true and (R) is the correct explanation of (A).

Answer

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

Answer

(A) is true but (R) is false.

Answer

(A) is false but (R) is true.

Magnetism and Matter

Choose the correct answer: