EASY
12th CBSE
IMPORTANT
Earn 100

The resistances of iron and copper wires at are and respectively. At what temperature will the resistances be equal? Temperature coefficient of resistivity for iron is and for copper it is . Neglect any thermal expansion.

Important Questions on Current Electricity
EASY
12th CBSE
IMPORTANT
The resistance of a silver wire at is . Up to what temperature it must be heated so that its resistance is doubled? The temperature coefficient of resistance of silver is . Will the temperature be same for all silver conductors of all shapes?

EASY
12th CBSE
IMPORTANT
The resistance of a coil used in a platinum‐resistance thermometer at is and at is . Its resistance at an unknown temperature is measured as . Calculate the unknown temperature.

EASY
12th CBSE
IMPORTANT
The temperature coefficient of a resistance wire is . At , its resistance is . At what temperature the resistance of the wire will be ?

EASY
12th CBSE
IMPORTANT
The temperature coefficient of resistivity of copper is . Find the resistance of a long copper wire of diameter at , if the resistivity of copper at is .

EASY
12th CBSE
IMPORTANT
Given the resistances of , and . How will you combine them to get an equivalent resistance of ?

EASY
12th CBSE
IMPORTANT
Given the resistances of , and . How will you combine them to get an equivalent resistance of ?

EASY
12th CBSE
IMPORTANT
Given three resistances of each. How can they be connected to give a total resistance of ?

EASY
12th CBSE
IMPORTANT
Given three resistances of each. How can they be connected to give a total resistance of ?
