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WorksheetsELECTROMAGNETIC INDUCTION
Total questions: 10
Worksheet time: 2mins
The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was
moving towards the solenoid
moving into the solenoid
at rest inside the solenoid
moving out of the solenoid
Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
P increases while in Q decreases
Q increases while in P decreases
both P and Q increases
both P and Q decreases
There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then
current is induced in the loop in the anti-clockwise direction.
current is induced in the loop in the clockwise direction.
ac is induced in the loop.
no current is induced in the loop.
Identify the wrong statement.
Eddy currents are produced in a steady magnetic field.
Eddy currents can be minimised by using laminated core
Induction furnace use eddy currents to produce heat
Eddy current can be used to produce braking force in moving trains.
An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to
the coil being in a time varying magnetic field.
the coil moving in a time varying magnetic field.
the coil moving in a constant magnetic field.
the coil is stationary in external spatially varying magnetic field, which does not change with time
Which of the following does not use the application of eddy current?
Electric power meters
Induction furnace
LED lights
Magnetic brakes in trains
Direction of induced current is such that it (a) the cause which produces it.
Total number of magnetic lines of force crossing a surface normally is called (a) .
Eddy currents can be minimized using a (a) core
The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?
No induced emf is developed.
The end A of the solenoid behaves like a south pole.
The end A of the solenoid behaves like a north pole.
The end A of the solenoid acquires positive potential.
