Question

The resistivity of copper is 1.77×10-11 Ωm. A copper wire of length 56.5 cm and cross-sectional area 1×10-6m2 is connected to the two sides of a 9 V battery. If no other resistance is connected to the battery, what will be the current flowing in the wire?

9.0×105 A


1.0×105 A


2.9×105 A


1.1×105 A

Answer 1

Current I is 9 × 10^-5

Step-by-step explanation:

Data :

resistivity = p = 1.77 × 10^-11 ohm m

Lenght = L = 56.5 cm = 0.565 m

Area = A = 1 ×10^-6 m²

Potential difference = V = 9v

Formula for resistivity

p = (RA)/ L

Put values

R = (p L)/A

R = 1 × 10^-5

Formula to find current I

V = IR or I = V/R

Put values

I = 9 /1 × 10^-5

I = 9 × 10 ^-5 A