In electromagnetic induction, the induced charge is independent of
change of flux
resistance of the coil
time
None of these
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A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An e.m.f. is induced in the loop, if
it is translated
it is rotated about its axis
both (a) and (b)
it is rotated about its diameter
The expression for the induced e.m.f. contains a negative . What is the significance of the
negative sign?
The induced e.m.f. is produced only when the magnetic flux decreases.
The induced e.m.f. opposes the change in the magnetic flux.
The induced e.m.f. is opposite to the direction of the flux.
None of the above.
The magnetic flux through a coil perpendicular to its plane is varying according to the relation Weber. If the resistant of the coil is , then the induced current through the coil at will be:
A coil having an area is placed in a magnetic field which changes from to in time interval t. The e.m.f. induced in the coil will be
Induced e.m.f.
The magnetic flux through a circuit of resistance changes by an amount in a time . Then the total quantity of electric charge that passes any point in the circuit during the time is represented by
If a current increases from zero to one ampere in 0.1 second in a coil of , then the magnitude of the induced e.m.f. will be
0.005 volt
0.5 volt
0.05 volt
5 volt
.
A coil has 200 turns and area of . The magnetic field perpendicular to the plane of the coil is and take to rotate through . The value of the induced e.m.f. will be
Change in flux
The magnetic flux linked with the coil (in Weber) is given by the equation The induced EMF in the coil at time, t=4 will be-
Volts
A coil having turns and resistance is connected with a galvanometer of resistance . This combination is moved in time seconds from a magnetic field weber to weber. The induced current in the circuit is
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