What is meant by mass defect?
(b) 100 W bulb draws 680 mA current. How much time will be required to pass 30 C of charge through the bulb?

A charge of 10 coulomb flows through a bulb in 5 second. What is the current through the bulb ?

A charge of 12 coulomb flows through a bulb in 5 second. What is the current through the bulb ?

A charge of 60 coulomb flows through a bulb in 5 minutes what is the current through the bulb ?

If 10 power 9 electrons move out of body to another body every seconds. How much time is required to get a total charges of 1 C on the other body?

a. Determine the electrostatic potential energy of a system consisting of two charges 7 muC and -2muC (and with no external field) placed at (-9 cm, 0,0) and (9 cm, 0, 0) respectively. b. How much work is required to separate the two charges infinitely away from each other? c. Suppose that the same system of charges is now placed in an external electric field E=A (1/r^(2)) , A =9 xx 10^(5) Cm^(-2) . What would the electrostatic energy of the configuration be?

An electric kettle takes 4A current at 220V . How much time will it take to boil 1 Kg of water from temperature 20^@ ? The temperature of boiling water is 100^@C .

(a) What is meant by electric current ? Give its direction ? (b) Name and define its unit. (c ) Which instrument is used to measure the electric current ? How should it be connected in a circuit ?