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प्रश्न
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
उत्तर
Bends in the wire will not affect its resistance. This is because the electrons are extremely small in size as compared to the bends. So, the electrons can easily change their direction of motion.
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संबंधित प्रश्न
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
Why is the series arrangement not used for domestic circuits?
The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
Give the law of combination of resistances in series.
Calculate the combined resistance in each case:
A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:
(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
How does the resistance of an alloy, vary with temperature?
Why are thick copper wires used as connecting wires?
