Question
Physics Question on Electromagnetic induction
A circular ring is placed in magnetic field of 0.4 T. Suddenly its radius starts shrinking at the rate of 1 mm/s. Find the induced emf in the ring at r = 2 cm.
A
16 πμV
B
8 πμV
C
16 πmV
D
8 πmV
Answer
16 πμV
Explanation
Solution
Rate of decrease in the radius of the loop is 2 mm/s.
Final radius = 2 cm= 0.02 m
Initial radius = 2.2 cm = 0.022 m. B = 0.04 T
Induced emf in the loop is given by
