Electromagnetic Induction

JEE Main 2024 (Online) 29th January Evening ShiftNumericalEasy📈 Topic in 22% papers+4

Ques. 1JEE Main 2024, 29 January (Evening Shift)

A horizontal straight wire 5 m long extending from east to west is falling freely at right angle to horizontal component of earth's magnetic field 0.60 10-4 Wbm-2. The instantaneous value of emf induced in the wire when its velocity is 10 ms-1 is 10-3 V.

Answer

Solution

Motional emf: =BHvl

∵ wire (E–W), velocity (vertical) and BH (S → N) are mutually perpendicular

=0.60 10-4 10 5

=3 10-3 V

Answer: 3

Keep practising — Electromagnetic Induction

Ques. 2JEE Main 2024, 27 January (Morning Shift)

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

-2 V
+2 V
+1 V
-1 V

Ques. 3JEE Main 2024, 27 January (Morning Shift)

Two coils have mutual inductance 0.002 H. The current changes in the first coil according to the relation i = i0 , where i0 = 5 A and = 50 rad/s. The maximum value of emf in the second coil is V. The value of is .

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