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प्रश्न
What do you understand by the term electric resistance?
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उत्तर
Electric resistance: The obstruction offered to the passage of electric current by a material is called resistance of the material.
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संबंधित प्रश्न
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?
In transferring 1.5 C charge through a wire, 9 J of work is needed. Find the potential difference across the wire.
A current 0.2 A flows in a wire of resistance 15Ω. Find the potential difference across the ends of the wire.
State two characteristics of resistance in the parallel circuit.
The following Figure represents a negatively charged gold Ieaf electroscope. Label the parts, P, Q, and R and the estate whether each is an insulator or a conductor. Also, indicate the distribution of charges on the system in the diagram.
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?
Write SI unit of
Resistance.
