Always try to "keep on" the standard of life even in the face of crisis.

Find the standard deviation of first n even positive integers.

Find the standard deviation of the first five even natural numbers.

(A) : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it. (R) : The average velocity of free electron in a conductor is zero in the absence of the electric field in it.

(A) : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it. (R) : The average velocity of free electron in a conductor is zero in the absence of the electric field in it.