The area under a current-time graph gives the electric charge. This is because electric charge \( Q \) is related to current \( I \) and time \( t \) by the formula: \[ Q = \int I \, dt \] Thus, the area under the current-time graph represents the total electric charge.
The correct option is (D): electric charge
Assertion (A): In the common domestic circuit, the earth wire is connected to a metallic plate buried deep inside the earth.
Reason (R): Earth wire ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, so the user may not get a severe electric shock.
