A rod in the shape of rectangular solid has cross-sectional area of 17.8 cm^2, l

Question

A rod in the shape of rectangular solid has cross-sectional area of 17.8 cm^2, length of 5.20 cm resistivity of 25.8 Times 10^-8 m. The material from which the block is made has 5.95 Times 10^28 conduction electrons/m^3. A potential differences of 52.6 m V is maintained between its ends. What is the current in the block? 6.98 Times 10^(3) A. 4.65 Times 10^(-1) A 5.81 Times 10^(-1) ma. 6.71 Times 10^(-30 mA. 9.31 times 10^(-2) A. Assume that the current density in the rod is uniform. What is its value? 6.761 Times 10^(-2) A. 4.65 Times 10^(-3)A. 5.81 Times 10^(-1) A.m^2. 6.71 Times 10^(-6) a/M^2. 3.92 Times 10^6a/m^2.

Explanation / Answer

I = V/R

R = rho*L/A

I = 6.98 x 10^3 A

part b )

J = I/A

J = 3.92 x 10^6 A/m^2

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