Statement $-1$ : Capacitor can be used in $a.c.$ circuit in place of choke coil.
Statement $-2$ : Capacitor blocks $d.c.$ and allows $a.c.$ only.
Statement$-1$ is true, Statement$-2$ is true; Statement$-2$ is not the correct explanation of Statement$-1.$
Statement$-1$ is false, Statement$-2$ is true.
Statement$-1$ is true, Statement$-2$ is false.
Statement$-1$ is true, Statement$-2$ is true; Statement$-2$ is the correct explanation of Statement$-1.$
If a direct current of $'a'$ amp is superimposed with an alternating current $'I = b\,sin \,\omega t',$ then effective value of resulting current is
The power is transmitted from a power house on high voltage $ac$ because
In a certain circuit current changes with time according to $i = 2\sqrt t .$ r.m.s. value of current between $t = 2$ to $t = 4s$ will be
$(a)$ The peak voltage of an $ac$ supply is $300\; V$. What is the $rms$ voltage?
$(b)$ The $rms$ value of current in an ac circuit is $10\; A$. What is the peak current?
Two cables of copper are of equal lengths. One of them has a single wire of area of cross-section $A$, while other has $10$ wires of cross-sectional area $A / 10$ each. Give their suitability for transporting $A.C.$ and $D.C.$