Advertisements
Advertisements
प्रश्न
How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?
उत्तर
Resistance is directly proportional to the length and inversely proportional to the square of radius. Specific resistance is independent on the dimensions of a wire.
APPEARS IN
संबंधित प्रश्न
Define specific resistance.
For which of the following substance, resistance decreases with increase in temperature?
How does specific resistance of a semi-conductor change with the increase in temperature?
Electrical resistivity of a given metallic wire depends upon:
What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?
The S.I unit of resistance is ______.
Name a substance which the specific resistance remains almost unchanged by the increase in temperature.
Two copper wires can have the different ______ but will have same ______.
State the order of specific resistance of a semiconductor.
What length of copper wire of specific resistance 1.7 × 10-8 Ω m and radius 1 mm is required so that its resistance is 2 Ω?