JEE Main202523 Jan 2025Morning ShiftPhysicsElectromagnetic InductionActual
Regarding self-inductance: A. The self-inductance of the coil depends on its geometry. B. Self-inductance does not depend on the permeability of the medium. C. Self-induced e.m.f. opposes any change in the current in a circuit. D. Self-inductance is electromagnetic analogue of mass in mechanics. E. Work needs to be done against self-induced e.m.f. in establishing the current. Choose the correct answer from the option
Options
- AA , B , C , E only
- BB, C, D, E only
- CA , C , D , E only
- DA, B, C, D only
Correct answer
C. A , C , D , E only
Step-by-step solution
A. The self-inductance of the coil depends on its geometry. This is true because the self-inductance of a coil is given by formulas that include its geometrical parameters (number of turns, cross-sectional area, length, etc.). For example, for a solenoid, (L= ₀ _r N^2 A l ) where (N ) is the number of turns, (A ) is the cross-sectional area, and (l ) is the length. B. Self-inductance does not depend on the permeability of the medium. This is false. The permeability of the medium (represented by ( = ₀ _r )) directly