The unit of resistivity is:
Ω / m
A wire of length L and resistance R is stretched so that its length its doubled. How will
(i) Resistance change (ii) Resistivity change?
Resistance increases 2 times; resistivity remains same
Resistance decreases 4 times; resistivity increases 2 times
Resistance decreases 2 times; resistivity increases 4 times
Resistance increases 4 times; resistivity remains same
How will the resistance be affected if the various parameters are changed as follows?
i) Length increasesx) Resistance increasesii) Area increasesy) Resistance decreasesiii) Resistivity decreasesz) Resistance remains the sameiv) Temperature increasesv) Velocity increases
(i-x) (ii-x) (iii-y) (iv-x ) (v-z)
(i-x) (ii-y) (iii-y) (iv-z ) (v-z)
(i-x) (ii-y) (iii-y) (iv-x ) (v-z)
(i-y) (ii-y) (iii-z) (iv-x ) (v-y)
Resistivity of a wire depends upon:
It is constant for a given material
Area of cross section
Length of the wire
Which characteristic of the conductor does not affect its resistance?
None of the above
The resistivity of all pure metals increase with the rise in temperature.
The substances whose resistivity lies between those of conductors and insulators are called ................ .
The materials that resist the flow of electric current are called_________.