The resistivity of potentiometer wire is 40 10^-8 Ωm metre and its area of cross-section is 8 10^-6 m^2. If 0.2 ampere current is flowing through the wire, the potential gradient of the wire is

Question

Accepted Answer

Correct answer: B. (b) Given =40 10^-8 Ωm A=8 10^-6 m^2 I=0.2 A R= ρlA ∴ Rl= A= 40 10^-88 10^-6=5 10^-2 Potential gradient Vl= IRl=0.2 5 10^-2=10^-2 V/m

$The resistivity of potentiometer wire is 40 \times 10^{- 8} Ωm metre and its area of cross-section is 8 \times 10^{- 6} m^{2} . If 0.2 ampere current is flowing through the wire, the potential gradient of the wire is$

Solution

More Current Electricity PYQs