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Ques. 1JEE Main 2024, 29 January (Morning Shift)
A square loop of side 10 cm and resistance 0.7 is placed vertically in east-west plane. A uniform magnetic field of 0.20 T is set up across the plane in north east direction. The magnetic field is decreased to zero in 1 s at a steady rate. Then, magnitude of induced emf is x 10-3 V. The value of x is .
Answer
2
Solution
Loop in the vertical east–west plane ⇒ its area vector points north.
Field towards north-east ⇒ angle between B and A is 45
=BA 45 =0.2 (0.1)2 1 2= 2 10-3 Wb
|e|= t= 2 10-3-01= 2 10-3 V
x=2
Answer: 2