SHORT ANSWER QUESTIONS
Q. 1. Why does a positive charge attract a negative charge?
Ans . It is the tendency of everybody to have minimum electric potential i.s to obtain zero potential. A positive charge means deficit of electrons while the negative charge indicates excess of electrons . Consequently, positive and negative charges attract each other to have minimum electric potential.
Q. 2 . A wire is carrying current it charged?
Ans - No. The current in a wire is due to the drifting of free electrons in a definite direction But the number of electrons in the wire at any instant is equal to the number of protons Hence, the net charge on the wire is zero .
Q.3 . What is a resistor and its function?
Ans . A component whose function in a circuit is to provide a specified value of resistance is called a resistor. Its function is to limit current, divide voltage, and is certain cases generate heat
Q. 4. What are the fundamental differences between c.m. and p.d. ?
Ans . The following are the differences between e.m.f. and pd .:
(i ) The name c.m.f. at first, sight implies that it is a force that caus current to now. But this is not correct because it is not a force but energy supplied to charge by some active device such as a battery.
(ii) E.ME maintains p.d. while p.d. causes current to flow .
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