12th Class Physics MCQS
The direction of induced current is always so as to oppose the change which causes the current, this is the statement of
Faraday’s law
Lenz’s law
Ampere’s law
Coulomb’s law
Electric current produces magnetic field, was suggested by.
Lenz
Henry
Faraday
Oersted
Lenz’s law was given by Heinrich lenz in:
1904
1894
1834
1854
In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:
0.1 henry
0.04 henry
0.2 henry
0.8 henry
DC generator by william Sturgeon in:
1961
1834
1961
1894
A.C is converted into D.C by
Rectifier
Transformer
Dynamo
Motor
What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10-2 Wb, and change in current is 0.01 A?
2 H
Zero
1/2 H
3 H