Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:
A. Of same magnitude in the same direction
B. Of different magnitude in the same direction
C.Of same magnitude but in opposite direction
D. Of different magnitude in the opposite direction
2
Referring to above figure, current in the coil P grows from zero to its maximum value
A. At the instant the switch is closed
B. At the instant the switch is opened
C.When switch is kept open
D. All of above
3
The direction of induced current is always so as to oppose the cause which produces it. This is
A. Lenz's law
B. Ampere's law
C.Faraday's law
D. Coulomb's law
4
The induced current in the loop can be increased by:
A. Using a stronger magnetic field
B. Moving the loop faster
C.Replacing the loop by a coil of many turns
D. All above
5
Split rings act as
A. Vibrator
B. Resistor
C.Motor
D. Commulator
6
The induced current in the loop can be Increased by
A. Using a stronger magnetic field
B. Moving the loop faster
C.Replacing the loop by a coil of many turns
D. All above
7
A metal road of length 1m is moving at a speed of 1 ms-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:
A. 0.25 N
B. 0.25 V
C.2.5 V
D. 2.5 N
8
The motional e.m.f depends upon the
A. Length of a conductor
B. Strength of a magnet
C.Speed of the conductor
D. All of the above
9
The induced emf in a coil is proportional to:
A. Magnetic flux through a coil
B. Rate of change of magnetic flux through the coil
C.Area of the coil
D. Product of magnetic flux and area of the coil
10
When a conductor moved with its length parallel to the lines of magnetic fled:
A. An emf is induced across its ends
B. Emf induced is similar to that of a battery
C.Emf passes through the conductor
D. Both A and B
11
An induced current can be produced by:
A. Constant magnetic field
B. Changing magnetic field
C.Varying magnetic feild
D. Constant electric field
12
A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:
A. Zero
B. Of smaller magnitude
C.Of larger magnitude
D. Sometimes B, sometimes C
13
Which of the following quantities remain constant in step up transformer?
A. Current
B. Voltage
C.Power
D. Heat
14
When the conductor moved across a magnetic field:
A. Emf induced is similar to that of a battery
B. Emf induced gives rise to induced current
C.An emf induced across its ends
D. All are correct
15
A device which converts Electrical energy into mechanical energy is called as
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