MEDIUM
JEE Main
IMPORTANT
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A bar magnet is passing through a conducting loop of radius with velocity The radius of the bar magnet is such that it just passes through the loop. The induced e.m.f. in the loop can be represented by the approximate curve:



(a)

(b)

(c)

(d)


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Important Questions on Electromagnetic Induction and Alternating Currents
MEDIUM
JEE Main
IMPORTANT
The alternating current is given by, . The R.M.S. value of this current is __________ .

MEDIUM
JEE Main
IMPORTANT
A constant magnetic field of is applied in the region. A metallic circular ring of radius is moving with a constant velocity of along the -axis. At , the centre of the ring is at . What will be the value of the induced emf in the ring at ? (Assume the velocity of the ring does not change.)

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JEE Main
IMPORTANT
An AC circuit has an inductor and a resistor of resistance in series, such that . Now, a capacitor is added in series such that . the ratio of the new power factor with the old power factor of the circuit is . The value of is

MEDIUM
JEE Main
IMPORTANT
A small square loop of side and one turn is placed inside a larger square loop of side and one turn The two loops are coplanar with their centres coinciding. If a current is passed in the square loop of side then the coefficient of mutual inductance between the two loops is :

EASY
JEE Main
IMPORTANT
In an ac circuit, an inductor, a capacitor and a resistor are connected in series with Impedance of this circuit is :

MEDIUM
JEE Main
IMPORTANT
A coil is placed in a magnetic field as shown below :

A current is induced in the coil because is :

MEDIUM
JEE Main
IMPORTANT
At very high frequencies, the effective impedance of the given circuit will be _________


EASY
JEE Main
IMPORTANT
For the given circuit the current through the battery when the key in closed and the steady state has been reached is
