Test: Electromagnetic Induction & Alternating Current (February 9) - NEET MCQ

A resistance of 50W, an inductance of 20/p henry and a capacitor of 5/p mF are connected in series with an A.C. source of 230 volt and 50Hz. The impedance of circuit is

The inductive reactance of a coil is 1000W. If its self inductance and frequency both are increased two times then inductive reactance will be

Predict the polarity of the capacitor in the situation described by fig.

An ac generator consists of 8 turns of wire, each of area A=0.0900m² , and the total resistance of the wire is 12.0Ω. The loop rotates in a 0.500-T magnetic field at a constant frequency of 60.0 Hz. Maximum induced emf is

Coils C₁ and C₂ are stationary. C₁ connected in series with one very small diwali bulb while C₂ is connected to a battery .If the connection is suddenly snapped

A coil of inductance 0.1 H is connected to an alternating voltage generator of voltage E = 100 sin (100t) volt. The current flowing through the coil will be

The emf and the current in a circuit are E = 12 sin (100pt) ; I = 4 sin (100pt + p / 3) then

Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, estimate of the self-inductance of the circuit is

If AC generator coil has area A, rotates in a magnetic field of B with an angular speed ω , the voltage generated is

If instantaneous value of current is I = 10 sin (314 t) A, then the average current for the half cycle will be

A metallic rod of 1 m length is rotated with a frequency of 50 rev/s about an axis passing through the centre point O. Other end of the metallic rod slides on a Metallic ring . A constant and uniform magnetic field of 2 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

RMS value of ac i = i₁ cos wt + i₂ sin wt will be