Specific resistance of a wire____________________?
Correct answer: C. will depend on the type of material of the wire
- A. will depend on its length
- B. will depend on its radius
- C. will depend on the type of material of the wire
- D. will depend on none of the above
Explanation
Specific resistance, or resistivity, is an intrinsic property determined mainly by the material and its temperature, not by the wire's length or radius. Option a, dependence on length, confuses resistivity with resistance, since R = ρL/A.
Last updated
About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A 1.0-ton split air conditioner (AC) operates at 220 V and uses 1090 W. The resistance of the air conditioner will be
A 5 ohm resistor is indicated by a single _ colour band around its body.
A 50Ω resistance wire is stretched such that its length is doubled and its cross section area becomes half. The new resistance is:
A carbon resistor connected to a battery of 50V and 2A current is passing through it. If voltage is increased to 75V then current will be:
A filament lamp behaves like an Ohmic conductor when its temperature