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Electromagnetic Induction
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Energy stored in a magnetic field is given by______________?
Related MCQs
A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?
Self-inductance of a long solenoid is__________?
The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is__________?
Self inductance of a coil depends upon__________?
For electroplating we use__________?
The only difference between construction of D.C generator and A.C generator is that of__________?
If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by__________?
A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is__________?
The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core__________?
An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is__________?
Non inductive resistances are used in decreasing__________?
Which one of the following devices does not function like an electric motor ?
For long distance transmission the transformer used is__________?
Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic__________?
When the motor is at its maximum speed then back emf will be__________?
Transformer works on the principle of__________?
An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called__________?
The out put voltage of a transformer is 3 times the input voltage then turns ratio will be__________?
Long distance transmission is easy for__________?
Magnetic compass needle will be deflecting if it is kept near__________?
A.C can not be used for__________?
A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience__________?
The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to__________?
The emf induced in a coil by a changing magnetic flux may have unit as__________?
Power loss in actual transformer is due to__________?
A.C and D.C have the same__________?
Which of the following uses electric energy and does not convert it into any other form ?
Inductors acts as a short circuit for__________?
If the coil is wound on an iron core the flux through it will__________?
Which of the following works on torque on the current carrying conductor placed in magnetic field ?
A.C cannot be used for__________?
Which one of the following functions like a motor ?
An alternating current or voltage__________?
emf induced in a circuit according to Faradays law depends on the__________?
Weber is the unit of__________?
A.C cannot be used for__________?
A dynamo converts__________?
cmf generated by A.C dynamo depends upon__________?
Current produced by moving the loop of wire across a magnetic field is called__________?
The practical illustration of the phenomenon of mutual induction is__________?
The polarity of the induced voltage can be determined by using the left-hand generator rule
Reversing the field or the current will reverse the force on the conductor
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
Which circuit element(s) will oppose the change in circuit current ?
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by__________?
A crack in the magnetic path of an inductor will result in__________?
The co-efficient of coupling between two air core coils depends on__________?
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is__________?
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is__________?
Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is__________?
Energy stored in a magnetic field is given by______________?
A. LI2
B. L2I/2
C. LI2/2
D. IL2
Correct Answer:
LI2
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Last Updated:
July 30, 2021