Answer:

Explanation:
Given that,
The current flowing in the circuit, I = 3 A
The power of the battery, P = 25 W
We need to find the resistance of the battery. We know that the power of the battery is given by the formula as follows :

Put all the values to find R.

So, the resistance is equal to
.
Answer:

Explanation:
A = Area = 
B = Magnetic field = 1.7 T
= Angle that magnetic field makes with the plane of the loop = 
t = Time = 0.42 s
EMF is given by

The magnitude of the average emf induced in the loop is
.