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Q.

A metallic resistor is connected across a battery. If the number of collision of the free electrons with the lattice is some how decreased in the resistor (for example, by cooling it), the current will 

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a

decrease

b

remain constant

c

become zero

d

increases

answer is A.

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Detailed Solution

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When the number of collisions of free electrons with the lattice is decreased in the resistor, then it means that less hindrance occurs in the flow of electrons, consequently, the resistance is low. Hence the current increases.

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