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प्रश्न
State the effect of rise in temperature on the resistance of semi-conductors.
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उत्तर
In the case of semi-conductors like carbon, silicon, germanium, etc., the resistance decreases with increase in temperature.
संबंधित प्रश्न
Give one example to show how the resistance depends on the nature of material of the conductor.
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
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :
- the effective resistance of the circuit.
- the reading of ammeter.
How does the resistivity of a semiconductor depend on temperature?
State expression for Resistance connected in series.
Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
