Q.

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): In a static magnetic field, the velocity of a charged particle changes only in direction.

Reason (R): Moving charged particle experiences magnetic force which is perpendicular to its direction of velocity.

1 Both A and R are true and R is the correct explanation of A  
2 Both A and R are true but R is not the correct explanation of A  
3 A is true but R is false  
4 A is false but R is true  

Ans.

(1)

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