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12th Physics Monthly Test - 2 ( Electromagnetic Induction And Alternating Current )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 2 ( Electromagnetic Induction And Alternating Current )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 2 - Answer All Question

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

What is phasort

Draw a graph showing variation of current with changing frequency of applied voltage in a series LCR circuit for two different values of resistance R1 & R2 (I₁ > I₂) fr - resonant frequency.

List out the advantages of stationary armature-rotating field system of AC generator.

What is inductive reactance X₁? How does it depend on frequencei Give its unit.

What are LC oscillations?

State Fleming’s right hand rule.

How will you define RMS value of an alternating current?
How is Eddy current produced? How do they flow in a conductor?

What are phasors?
Give the principle of AC generator.

Distinguish between AC and DC.

What for an inductor is used? Give some examples.

What is meant by electromagnetic induction?

Define average value of an alternating current.

Explain the use of transformers in long distance transmission of electric power

A rectangular loop of wire is moved within the region of a uniform magnetic field acting perpendicular to its plane. What is the direction and magnitude of current induced in it?

What do you mean by resonant frequency?

State Faraday’s laws of electromagnetic induction.

How will you define Q-factor?

Define electric resonance

Write the application of series RLC resonant circut

What is waltless current?

What are LC oscillations.

The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet what is the cause of this damping?

Define power factor?

What do you mean by self-induction?

Part - B

Generic 5 - Answer All Question

What is alternating current? Write an expression for its instantaneous value and write the frequency of DC.

Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.
Two air core solenoids have the same length of 80 cm and same cross–sectional area 5 cm². Find the mutual inductance between them if the number of turns in the first coil is 1200 turns and that in the second coil is 400 turns.

Calculate the instantaneous value at 60o, average value and RMS value of an alternating current whose peak value is 20 A.

A rectangular coil of area 6 cm² having 3500 turns is kept in a uniform magnetic field of 0.4 T. Initially, the plane of the coil is perpendicular to the field and is then rotated through an angle of 180o. If the resistance of the coil is 35 Ω, find the amount of charge flowing through the coil.

The equation for an alternating current is given by i = 77 sin 314t. Find the peak value, frequency, time period and instantaneous value at t = 2 ms.

The current flowing in two coils of self inductance L1 = 20mH and L2 = 15mH are increasing at the same rate. If the power supplied to the two coils are equal. Find the ratio of
(i) induced emf
(ii) induced current and
(iii) the energies stored in the two coils at a given instant .

A toroidal solenoid with air core has an average radius of 15cm, area of cross section 12cm² and has 2000 turns. Calculate the self- inductance of the toroid. Assume the field to be uniform across the cross-section of the toroid.

A coil of 200 turns carries a current of 0.4 A. If the magnetic flux of 4 mWb is linked with the coil, find the inductance of the coil.

A rectangular loop of area 20cm x 30cm is placed in a magnetic field of 0.3T with its plane
(i) normal to the field
(ii) inclined 30° to the field and
(iii) parallel to the field. Find the flux linked with the coil in each case.

The magnetic flux through a coil perpendicular to the plane is given by Φ = 5t³ +4t² +2t calculate the induced emf through the coil at t = 2S

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