Electromagnetic Induction

SI unit of magnetic flux is

Lenz's law obeys the principle of $\_\_\_\_$ conservation

An inductor may store energy in

A coil of 40 henry inductance is connected in series with a resistance of 80 hm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

The core of a transformer is usually made of

A graph of magnetic flux $(\Phi)$ versus current $(\mathrm{I})$ is shown for four inductors A, B, C, D. The smallest value of self inductance is for inductor.

The magnetic energy stored in an inductor of inductance 4 H carrying a current of 1.5 A is

The plot of magnetic flux ' $\phi$ ' linked with the coil versus current ' $I$ ' is as shown in figure for two inductors $\mathrm{L}_{1}$ and $\mathrm{L}_{2}$. The self inductance of

In a transformer (ideal), the primary has 500 turns and secondary has 50 turns. 100 volt potential is applied to the primary coil. The voltage developed in the secondary will be

Eddy currents are produced when

If the flux associated with a coil changes at the rate of 360 weber in every 4 minutes, then the induced e.m.f. is

Consider two coils in which a current in one coil carrying 6 A causes the change in the flux in the second coil $12 \times 10^{-4}$ weber/turn. The second coil has 2000 turns. The mutual inductance between the coils is

A graph of magnetic flux ( $\phi$ ) versus current ( $I$ ) is shown for four inductors $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}$. The largest value of self-inductance is for inductor

When the number of turns in a coil are made 3 times without any change in the length of the coil, its self inductance becomes

The core used in transformers are laminated to