Physics Past Questions and Answers

A working electric motor takes a current of 1.5 A when the p.d across it is 250V. If its efficiency is 80%, the power output is

The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is

In a Daniel cell, the depolarizer, positive and negative electrodes are respectively

when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will

the ratio of electrostatic force F<sub style='font-size: smaller;'>E</sub> to gravitational force F<sub style='font-size: smaller;'>G</sub> between two protons each of charge e and mass m, at a distance d is