Answer:
He could re read his answear.
Explanation:
It takes work to push charge through a change of potential.
There's no change of potential along an equipotential path,
so that path doesn't require any work.
Answer:

Explanation:
We are given that



We have to find the angle of refraction.
By Snell's law

Substitute the values




Hence, the angle mad by refracted ray in to the glass with normal=
Newton’s 3rd law of motion
You faded out there before asking your question.
Here's some info that might be of interest:
Torque = (force) x (distance from the pivot) = (10 n) x (0.9 m) = 9 newton-meters