XII_Physics_Electromagnetic Induction_5 Online Test

Lenz's law gives ____.
The magnitude of the induced e.m.f.
The direction of the induced current
Both the magnitude and direction of the induced current
The magnitude of the induced current
The north pole of a bar magnet is moved swiftly downward towards a closed coil and then second time it is raised upwards slowly. The magnitude and direction of the induced currents in the two cases is of ____.
First case Second case Low value clockwise Higher value anticlockwise
First case Second case Low value clockwise Equal value anticlockwise
First case Second case Higher value clockwise Low value clockwise
First case Second case Higher value anticlockwise Low value clockwise
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum wills ____. 
Keep oscillating with the old time period
Keep oscillating with a smaller time period
Keep oscillating with a larger time period
Come to rest very soon
A circular coil of 500 turns of wire has an enclosed area of  per turn. It is kept perpendicular to a magnetic field of induction 0.2 T and rotated by 180° about a diameter perpendicular to the field in 0.1 sec. How much charge will pass when the coil is connected to a galvanometer with a combined resistance of 50 ohms?
0.2 C
0.4 C
2 C
4 C
The direction of induced current is such that it opposes the very cause that has produced it. This is the law of ____.
Lenz
Faraday
Kirchoff
Fleming
To induce an e.m.f. in a coil, the linking magnetic fluxes ____.
Must decrease
Can either increase or decrease
Must remain constant
Must increase
A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly ____.
2.5 ( 10–7 weber
6.31 ( 10–6 weber
5.2 ( 10–5 weber
4.1 ( 10–5 weber
A coil of 40 (resistances has 100 turns and radius 6 mm is connected to ammeter of resistance of 160 ohms. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, 32 ( C charge flows through it. The intensity of magnetic field is ____.
6.55 T
5.66 T
0.655 T
0.566 T
Faraday's laws are consequence of conservation of ____.
Energy
Energy and magnetic field
Charge
Magnetic field
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will ____.
Increase
Decrease
Remain unchanged
The information is incomplete
Description:

This test consist of 10 questions.Students should ideally take 10 minutes to complete the test. This test is useful for those students who are preparing for IIT JEE, AIEEE or any other engineering entrance test. This test consist of questions from Electromagnetic Induction and which, in general, is focused in AIEEE and IIT JEE. In this chapter,magnetic flux faraday's law lenz's law eddy current inductance ac generatorare key topic and mostly application based questions are asked.

Discussion

yogesh waran

thanks

3889 days 14 hours 8 minutes ago

nagasanthosh

please give ans for all que

4245 days 13 hours 35 minutes ago

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