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n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, then write an expression for the current in the conductor.
What do you understand by the term resistance?
How is the current flowing in a conductor changed if the resistance of conductor is doubled keeping the potential difference across it the same?
State three factors on which the resistance of a wire depends. Explain how the resistance depends on the factors stated by you.
How many electrons constitute one unit electric charge in SI system?
Select the correct option:
In a metallic conductor, electric current is thought to be due to movement of:
State two conditions necessary for a circuit, such that electric current flows through it.
The following figure shows a metal rod PQ mounted on an insulated stand. The cap of an uncharged electroscope touches one end Q of the metal rod. A negatively charged ebonite rod is brought near the other end P of the metal rod.
(a) What charge does the end P have?
(b) What charge does the end Q have?
(c) What charge does the cap of the electroscope have?
(d) What charge does the gold leaf have?
(e) Will the leaf diverge or collapse? Give reason.
(f) If the electroscope is now earthed, what charge does the metal rod have?
