हम लोग long time कैसे motivated रहे

The circuit shown has been connected for a long time. The voltage across the capacitor is

Why a dry cell becomes dead after a long time even if it is not used ?

In the circuit shown, initially the switch is in position 1 for a long time. Then the switch is shifted to position 2 for a long time. Find the total heat produced in R_(2)

A train 280m long is moving at a speed of 60kmph. What is the time taken by the train to cross a platform 220 long