Q8 of 52 Page 354

Define the electric resistivity of material and also write its SI unit.

Resistivity: It is defined as the resistance offered by a conductor having unit length and unit cross-sectional area. It is denoted by (rho).



The SI unit of resistivity in Ωm.


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6

The potential difference across wire is 75V and its electric resistance is 30Ω. Find out the electric current through the wire.

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If the length of a wire is halved and its cross-sectional area is doubled, then what would be the resistance of the wire?

(Given, initially the resistance of the wire is R)

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In which type of combination of different resistors will have equal value of electric current through them?

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IF different resistors have the same value of electric potential across them, in which way they are connected to each other?