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12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 2 Mark Questions with Solution Part - I

Published on: 18/06/2021

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Std: 12th Standard - Physics

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Find the direction of the induced current in the rectangular loop P&RS is moving into a uniform magnetic field acting at right angles to the plane of the paper.

State the law that gives the polarity of the induced emf.

Define power factor?

What is the signifienance of Quality factor or Q-factor.

Write the application of series RLC resonant circut

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Answers Key:

Generic 2

5 x 2 = 10

Due to the motion of the coil, the magnetic flux linked with the coil increases. So by Lenz's law, the current induced in the coils will oppose this increase, hence the current induced in the coil will flow anticlockwise i.e along PSRQP.

Lenz's law the polarity of the induced emf is such that it tends to produce current which oppose the change in magnetic flux that produces it.

The power factor of a circuit is defined in one of the following ways:
(i) Power factor = cos Φ= cosine of the angle of lead or leg
(ii) Power factor = \(\frac{R}{Z}\) = \(\frac{Resistance}{Impedance}\)
(iii) Power factor = \(\frac { VI \ cos \ \Phi }{ VI } \) = \(\frac{True \ power}{Apparent \ power}\)

The current in the series RLC circuit becomes maximum at resonance. Due to the increase in current, the voltage across L and C are also increased. This magnification of voltages at series resonance is termed as Q-factor. It gives a measure of sharpness of current peak in the resanance condition of LCT circuit

RLC circuits have many applications like filter circuits, oscillators, voltage multipliers, etc. An important use of series RLC resonant circuits is in the tuning circuits of radio and TV systems.