A. Magnetic flux density
B. Torque
C. Mutual induction
D. Motional emf
Correct Answer: Magnetic flux density ✔
Last Updated: July 30, 2021
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__________?
- Energy stored in a magnetic field is given by__________?
- 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 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__________?