2307. Resistance of a conductor of diameter and length L is R ohm. It the diameter of the conductor is halved and its length is doubled the resistance will be-.
2309. Which of the following quantites consist of unit as WATT?
ব্যাখ্যা: The St unit of power is the watt and it is discover by the Scottish Engineer James Watt. Power is the rate of consumption of electric energy. So, it is equivalent joules per second.
2315. Two charged spheres of radii 10cm and 15cm are connected by a thin wire. No current will flow if they have-
ব্যাখ্যাঃ The current flows from higher potential to lower pontential. And if the potential difference is zero, then no current flows through the wire.
ব্যাখ্যা: A battery is a device that stores electric power in the form of chemical energy. When necessary the energy a again released as electric power for DC consumers such as lighting and starter motors.