Embibe Experts Solutions for Chapter: Current Electricity, Exercise 4: Exercise-4

Each of the batteries shown in figure has an emf equal to $10 \mathrm{V}$. Find the magnetic field $B$ at the point $P$.

In the circuit shown in figure, the capacitors are initially uncharged. The current through resistor $PQ$ just after closing the switch is,

An uncharged capacitor of capacitance $4 \mathrm{\mu F}$, a battery of emf $12 \mathrm{V}$ and a resistor of $2.5 \mathrm{M\Omega }$ are connected in series. The time after which $V_{\mathrm{C}}=3V_{\mathrm{R}}$ is (take, $\ln 2=0.693$),