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Electromagnetic Induction

JEE Main 2025 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

Regarding self-inductance: Choose the correct answer from the options given below:

  1. A, B, C, E only
  2. A, B, C, D only
  3. A, C, D, E only
  4. B, C, D, E only

Answer

(3) A, C, D, E only

Solution

L= I, =-L dIdt, U= 12LI2

A true: L= 0 rN2Al depends on geometry; B false: it depends on the medium through r

C true: Lenz's law; D true: L is the inertia of current, like mass; E true: work 12LI2 against the back emf

Only B is false.

Answer: (3)

Keep practising — Electromagnetic Induction

Ques. 2JEE Main 2025, 23 January (Morning Shift)

[figure] In the given circuit the sliding contact is pulled outwards such that electric current in the circuit changes at the rate of 8 A/s. At an instant when R is 12 , the value of the current in the circuit will be A.

Ques. 3JEE Main 2025, 22 January (Evening Shift)

A rectangular metallic loop is moving out of a uniform magnetic field region to a field free region with a constant speed. When the loop is partially inside the magnetic field, the plot of magnitude of induced emf ( ) with time (t) is given by

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

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