RE-NEET Physics Electromagnetic Induction Class 12 Questions

A conducting loop of finite resistance lies on the x-y plane. There is a constant magnetic field in the z direction. The area of the loop varies with time t, as A = A₀(¹⁺ sin t) in appropriate units. The figure that correctly indicates the qualitative behaviour of the power P dissipated in the loop as a function of time is:

Two identical inductors are connected in two different configurations P and Q, where a time varying current I(t) is flowing, as shown in the figure. The induced emf between points a and b for configuration P is Eₚ and that for configuration Q is Eₚ. The ratio Eₚ/Eₚ is : [Neglect the effect of mutual inductance.]

In the circuit shown below, the inductance L is connected to an ac source. The current flowing in the circuit is I = I₀sinωt. The voltage drop (Vₗ) across L is

A step up transformer is connected to an ac mains supply of 220 V to operate at 11000 V, 88 watt. The current in the secondary circuit, ignoring the power loss in the transformer, is

Let us consider two solenoids A and B, made from same magnetic material of relative permeability μᵣ and equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of B. The ratio of self inductances of the two solenoids, Lₐ : Lᵦ is

The amplitude of the charge oscillating in a circuit decreases exponentially as Q = Q₀e⁻ᴿᵗ/²ᴸ, where Q₀ is the charge at t = 0s. The time at which charge amplitude decreases to 0.50 Q₀ is nearly: [Given that R = 1.5 Ω, L = 12 mH, ln(2) = 0.693]