The drift velocity of electrons for a conductor connected in an electrical circuit is $V_d$. The conductor is now replaced by another conductor with same material and same length but double the area of cross-section. The applied voltage remains same. The new drift velocity of electrons will be

A water heater of power $2000 \mathrm{W}$ is used to heat water. The specific heat capacity of water is $4200 \mathrm{J} {\mathrm{kg}}^{-1} {\mathrm{K}}^{-1}$. The efficiency of heater is $70\%$. Time required to heat $2 \mathrm{kg}$ of water from $10°\mathrm{C}$ to $60°\mathrm{C}$ is _____ $\mathrm{s}$.

(Assume that the specific heat capacity of water remains constant over the temperature range of the water).

The equivalent resistance between $A and B$ of the network shown in figure:

In the given circuit the value of $\left|\frac{I_1+I_3}{I_2}\right|$ is: