EASY
12th CBSE
IMPORTANT
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The resistance of a silver wire at 0° C is 1.25 Ω. Up to what temperature it must be heated so that its resistance is doubled? The temperature coefficient of resistance of silver is 0.00375∘C−1. Will the temperature be same for all silver conductors of all shapes?

Important Questions on Current Electricity

EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 4
The resistance of a coil used in a platinum‐resistance thermometer at 0° C is 3.00 Ω and at 100° C is 3.75 Ω. Its resistance at an unknown temperature is measured as 3.15 Ω. Calculate the unknown temperature.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 5
The temperature coefficient of a resistance wire is 0.0012.5°C−1. At 300 K, its resistance is 1 Ω. At what temperature the resistance of the wire will be 2 Ω?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 6
The temperature coefficient of resistivity of copper is 0.004°C−1. Find the resistance of a 5 m long copper wire of diameter 0.2 mm at 100°C, if the resistivity of copper at 0°C is 1.7×10−8Ωm.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 1
Given the resistances of 1 Ω, 2 Ω and 3 Ω. How will you combine them to get an equivalent resistance of 113 Ω?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 1
Given the resistances of 1 Ω, 2 Ω and 3 Ω. How will you combine them to get an equivalent resistance of 115 Ω?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 2
Given three resistances of 30 Ω each. How can they be connected to give a total resistance of 90 Ω?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 2
Given three resistances of 30 Ω each. How can they be connected to give a total resistance of 10 Ω?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 2
Given three resistances of 30 Ω each. How can they be connected to give a total resistance of 45 Ω?