JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Current Electricity

A meter bridge with two resistances $R_1$ and $R_2$ as shown in figure was balanced (null point) at 40 cm from the point P. The null point changed to 50 cm from the point P, when $16\Omega$ resistance is connected in parallel to $R_2$. The values of resistances $R_1$ and $R_2$ ar …

An electric power line having total resistance of $2\Omega$, delivers 1 kW of power of 250 V. The percentage efficiency of transmission line is $\_\_\_\_$.

A cylindrical conductor of length 2 m and area of cross-section $0.2{\mathrm{mm}}^2$ carries an electric current of 1.6 A when its ends are connected to a 2 V battery. Mobility of electrons in the conductor is $\alpha \times 10^{-3}{\mathrm{m}}^2/\mathrm{V}$.s. The value of …

The charge stored by the capacitor C in the given circuit in the steady state is $\_\_\_\_$ $\mu \mathrm{C}$.

The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If P is the point where the galvanometer shows zero reading then the length AP is $\_\_\_\_$ cm .

A battery with EMF E and internal resistance $r$ is connected across a resistance $R$. The power consumption in R will be maximum when :