Question

Derive an expression for the force per unit length between two straight parallel conductors carrying current. Hence define ampere.

Answer 1

Answer:

For normal incidence on a plane mirror identify which of these statements are true --

(I) Both the angles of incidence and reflection are 0 degree .

(II) Both the angles of incidence and reflection are 90 degree .

(III) The angles that both the incident ray and the reflected ray make with the mirror surface are 0 degree .

(IV) The angles that both the incident ray and the reflected ray make with the mirror surface are 90 degree ..

A) Only (I) is true .

B) Only (II) is true .

C) Both (I) and (III) are true .

D) Both (I) and (IV) are true ✔