Question
Physics Question on Magnetism and matter
The power required (by an external agent) to keep the road moving at the same speed (=12cms-1)when K is closed will:
A
zero
B
9✕10^-3 W
C
4.5✕10^-3W
D
6.4✕10^-3
Answer
4.5✕10^-3W
Explanation
Solution
The correct answer is (C): 4.5✕10^-3W