ECAT Physics Chapter 15 Electromagnetic Induction Online Test With Answers

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ECAT Physics Chapter 15 Electromagnetic Induction Online Test

Sr. # Questions Answers Choice
1 In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is: 0.2 henry 0.1 henry 0.8 henry 0.04 henry
2 The induced emf in a coil is proportional to: Magnetic flux through a coil Rate of change of magnetic flux through the coil Area of the coil Product of magnetic flux and area of the coil
3 What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10-2Wb, and change in current is 0.01 A? 2 H 3 H 1/2 H Zero
4 The device in which induced emf is statically induced emf is: Transformer AC generator Alternator Dynamo
5 For inducting emf in a coil the basic requirement is that: Flux should link the coil Change in flux should link the coil Coil should form a closed loop Both B and C are true
6 Referring to above figure, due to change in current in the coil P, the change in magnetic flux Is associated with coil P Is associated with coil S Causes and induced current in coil S All of these None of these
7 Referring to above figure, current in coil P falls from its maximum value to zero At the instant the switch is closed At the instant the switch is opened When switch is kept open When switch is kept closed None of these
8 Referring to above figure, current in the coil P grows from zero to its maximum value At the instant the switch is closed At the instant the switch is opened When switch is kept open All of above Neither of above
9 A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when The coil is distorted The coil is rotated The coil is neither distorted nor rotated Both A and B None of these
10 Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current Of same magnitude in the same direction Of different magnitude in the same direction Of same magnitude but in opposite direction Of different magnitude in the opposite direction None of these
11 When there is no relative motion between the magnet and coil, the galvanometer indicated No current in the circuit An increasing current A decreasing current A constant current Either B or C
12 The magnitude of induced emf depends upon the Rate of decrease of magnetic field Rate of change of magnetic field Rate of increase of magnetic flux Constancy of magnetic field None of these
13 Michael Faraday and Joseph Henry belong respectively to USA and England England and France England and USA USA and France None of these
14 In magnet-coil experiment, emf can be produced by Keeping the coil stationary and moving the magnet Keeping the magnet stationary and moving Relative motion of the loop and magnet Any one of above All above
15 The induced current in the loop can be Increased by Using a stronger magnetic field Moving the loop faster Replacing the loop by a coil of many turns All above Both A and B
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