The circuit shown in the diagram is assembled from two 1.5 V batteries, thick co

Question

The circuit shown in the diagram is assembled from two 1.5 V batteries, thick copper connecting wires,

and two conducting rods. Rod 1 has a cross sectional area of 2.0

The circuit shown in the diagram is assembled from two 1.5 V batteries, thick copper connecting wires, and two conducting rods. Rod 1 has a cross sectional area of 2.0?10-6 m2and a length of 7 cm. Rod 2 has a cross sectional area of 1.5?10-7m2and is 16 cm long. The material of which both rods are made has 3?1025mobile electrons per cubic meter, and an electron mobility of 3?10?4(m/s)/(N/C).You may assume that the electric fields in the copper connecting wires is very small compared to the electric fields in the conducting rod a. What is the magnitude of the electric field at location A in rod 1? b. What is the conventional current passing through rod 1 c. What is the resistance of rod1

Explanation / Answer

total V =3 volt

electric field

R1=rho L1/A1 and rho =1/sigma

R2=rho L2/A2

sigma =ne mu

           =3 x 10^2 X 1.6 x 10^-19x3x10^4 =1.44 x 10 ^11

a) R1 =2.4 x10^-7 ohm

R2 =7.4 x 10^-6 ohm

i=V/R =392133

V1=IR1 =0.093

E=V/l

=0.093/0.07=1.36

V=IR

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