ElectroMagnetic Induction Questions

A condenser of capacity C is charged to a potential difference of V1 The plates of the condenser are connected to an ideal inductor of inductance L. The current through the inductor when the potential...

The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 A m-1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the mag...

A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6A, the voltage across thesecondary coil and the current in the primary coil r...

In the circuit shown here, the point ′C′ is kept connected to point ′A′ till the current flowing through the circuit becomes constant. Afterward, suddenly, point ′C&#8242...

If I1, I2, I3 and I4 are the respective r.m.s. values of the time varying currents as shown in the four cases I, II, III and IV. Then identify the correct relations...

A bent rod PQR (PQ = QR = l) shown here is relating about its end P with angular speed ω in a region of transverse magnetic field of strength B....

A metallic rod of length ′l′ is tied to a string of length 2l and made to rotate with angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical m...

A wire loop is rotated in magnetic field. The frequency of change of direction of the induced e.m.f. is :

A coil is suspended in a uniform magnetic field,with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficul...

In a coil of resistance of 10Ω, the induced current developed by changing magnetic flux through it,is shown in figure as a function of time. The magnitude of change in flux through the coil in We...

A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux φ (wb) linked with the coil varies with time t (sec) as φ = 50 t2 + 4, the current in the coil at t = 2 se...

A boat is moving due east in a region where the earth′s magnetic field is 5.0 × 10-5 NA-5 m-5 due north and horizontal. The boat carries a vertical aerial 2m long. If the speed of the boat is 1....

A rectangular loop has a sliding connector PQ of length l and resistance R Ω and it is moving with a speed v as shown. The set-up is placed in a uniform magnetic field going into the plane of th...

In the circuit shown below, the key K is closed at t = 0. The current through the battery is...

A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is , the net force on the remaining three arms of the loop ...

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1mm/s-1. The indu...

A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 amp at 440 volts. If the efficiency of the transformer is 80 %, the current drawn by the primary windings of the t...

A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B, constant in time and space pointing perpendi...

A thin semicircular ring of radius R is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ the speed of the ring is v and the potential difference across the ring...

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. ...