Electromagnetic Induction

A rectangular loop of length 2.5 m and width 2 m is placed at 60 to a magnetic field of 4 T. The loop is removed from the field in 10 sec. The average emf induced in the loop during this time is

1. -2 V
2. +2 V
3. +1 V
4. -1 V

Answer

(3) +1 V

Solution

avg=- t, =BA

60 is the angle between B and the area vector of the loop

i=4 (2.5 2) 60 =10 Wb, f=0

avg=- 0-1010=+1 V

Answer: (3)