Alternating Cur...

A $$50Hz$$ alternating current of peak value $$1$$ ampere flows through the primary coil of a transformer. If the mutual inductance between the primary and secondary be $$1.5$$ henry, then the mean value of the induced voltage is:

In the circuit shown in figure. the a.c. source gives a voltage V = 20 $$\cos ( 200 \pi + 1 )$$ The reading of vulimeter and amineter will be

A direct current of 10 A is superimposed on an alternating current $$l=40\cos\omega t\left( A \right) $$ flowing through a wire. The effective value of the resulting current will be 

A student connects a long air cored coil of manganin wire to a $$100VD.C.$$ supply and records a current of $$25amp$$. When the same coil is connected across $$100V.50z a.c.$$ the current reduces to $$20A$$, the reactance of the coil is:-

If resonant frequency of a R-L-C circuit is $$\Delta \omega $$, then which of the following quantity is regarded as a measure of the sharpness of resonance?

An alternating current is given by
$$i={i}_{1}\cos{\omega t}+{i}_{2}\sin{\omega t}$$. The rms current is given by:

The most appropriate I-H curve for a paramagnetic substance is:

The tuned collector oscillator circuit used in the local oscillator of a radius receiver makes use of a tuned circuit with $$L=60\mu H$$ and $$C=400pF$$.
Calculate the frequency of oscillations

In the given circuit $$R$$ is a resistor. $$L$$ is an inductor and $$B _ { 1 }$$ and $$B _ { 2 }$$ are two bulbs and initially the switch $$S$$ was closed. If the switch $$S$$ is turned off. Then 

Alternating current is given by i = (3 sin $$\omega$$ t + 4 cos $$\omega$$ t)A  the rms current will be