Answer:
(a) 6.283 Wb (b) 69.11 Wb (c) I = 0.628 A
Step-by-step explanation:
Given that,
The diameter of the loop, d = 40 cm
Radius, r = 20 cm
Initial magnetic field, B = 5 mT
Final magnetic field, B' = 55 mT
Initial magnetic flux,

Final magnetic flux,

Due to change in magnetic field an emf will be generated in the loop. It is given by :

Let I be the current in the loop. We can find it using Ohm's law such that,

Hence, this is the required solution.