Resistivity of a material only depends on the nature of the material and does not depend on its size or dimensions, i.e, length, area of cross - section etc. So, the resistivity of the will not change after its length is doubled and area of cross - section is halved.
Hence, correct option is : (b) .
A wire has resistivity p, its LENGTH I DOUBLED and its AREA OF CROSS SECTION IS...
A wire of length 0.47 meters and cross-section area 7.1 cm 2 has resistivity 96x10 -6 Ohm-meters. What is the resistance (in Ohms) of this wire?
QUESTION 3 A rod, of length L and square cross section of side a, has a resistance R. What is the new value of the resistance R' if the length is doubled (21) and the cross section side is halved (a/2)? OR'-2R OR 4 R' = R 2 RER
The resistance R of a wire of length l and uniform area of cross-section A is given by R = rhol/A, where rho is the resistivity of the wire. You melt the wire and recast it to have a new length l' = 10l (keeping the volume V = Al of the wire constant). What is the new resistance of the wire, if the original resistance of the wire was 100.0 Ohm.
4. Do resistance and resistivity depend on: - the wire length? - the wire cross-section? - the wire shape?
A copper wire has cross section area 0.002 m' and length of 400 m, what is the resistance of this copper wire? When a 200-V potential difference is applied over the wire, what is the current through the wire and what is the electric power? If the current is uniformly distributed, what is the current density? If the drift speed is 10 m/s, what is the number density of electrons in the wire? (Given copper's resistivity as 2x10 s2 m)....
A wire of length L and cross-sectional area A has resistance R. What will be the resistance Rstretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched.
A cylindrical wire has a resistance r and resistivity p if its length and diameter are both cut in half what will be its resistance? What will be its resistivity?
3. The electric resistance of a wire having length, cross section d and resistivity ? is R : When the wire is stressed long t man. each of the three quantities that affect R changes and therefore R undergoes a change. Please derive the expression fordR/R in relation to the strain ? . (25)-
A particular wire has a resistivity of 5.37×10-8 Ωm and a cross-sectional area of 1.78 mm2. A length of this wire is to be used as a resistor that will develop 150 W of power when connected to a 6.50 V battery. What length of wire is required?
A particular wire has a resistivity of 2.1*10^-8 Ω · m and a cross-sectional area of 2.9*10^-6 m2. A length of this wire is to be used as a resistor that will receive 41 W of power when connected across a 20-V battery. What length of wire is required? _________km