Question

determine the current density in an aluminium wire of length 2.00 m amd radius 0.650 cm. the potential difference between the ends of wire is 60.0 V.​

Answer 1

Given :

- Length of wire = 2.00 m

- Radius of wire = 0.650 m

- Potential difference between the ends of wire = 60.0 V

To find :

• Current density

Solution :

• We know that, current density is given by

J = I / A

where I = current flowing in wire and A = cross section area of wire

J = (V/R)×(1/A)

R = rho×L / A

• Therefore,

J = (V×A / rho×L)×(1/A)

= V / rho×L

• We do not have value of specific resistance in question, So we cannot proceed further.