12th Class Physics MCQS
1 Henry =
V-1SA
VS-1A-1
VSA-2
VSA-1
The movement of conductor in magnetic field produces electrical current was discovered in:
1842
1931
1731
1831
The current induced can be increased by:
Replacing the loop bay coi of many turns
Moving the loop faster
All of above
Using a stronger magnetic field
Energy stored in an inductor is:
1/2LI
1/2LI2
1/2L2/I
1/2L2I
Michael Faraday and Joseph Henry belongs to
None of these
England and USA
China and USA
France and USA
When the back emf in a current is zero, it draws
Maximum current
Zero current
Minimum current
Steady average current
The device in which induced emf is statically induced emf is:
AC generator
Transforms
Alevator
Dynamo
The direction of induced current is always so as to oppose the change which causes the current is:
Kirchhoff’s 1st rule
Faraday’s law
Ohm’s law
Lenz’s law
The Lenz’s law is also statement of:
Law of conservation of mass
Law of conservation of charge
Law of conservation of momentum
Law of conservation of energy
Eddy current is produced when:
A metal is light in varying magnetic field
A current is passed through a circualr coil
A circular coil is placed in a steady magnetic field
A metal is kept in steady magnetic field
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