Question

8.)A wire carries a steady current of 0.1 Ampere over a period of 20 seconds. What total charge passes through the wire in this time interval? (3 points) 9.)A 12- C charge is located in a 350-N/C electric field. What is the force on the charge? (3points) 10.) Find the equivalent resistance of the circuit shown below. (6 points) 1o0n M- 4,00 Ω 8.00 V

Answer 1

8.

$I=\frac{Q}{t}$

$\Rightarrow Q=I\times t=0.1\times 20=2\ C$

9.

$F=QE=12\times 10^{-6}\times 350=4.2\times 10^{-3}\ N=4.2\ mN$

10.

The effective resistance at 1 is

$\frac{1}{R_1}=\frac{1}{10}+\frac{1}{5}=\frac{3}{10}$

$\Rightarrow R_1=\frac{10}{3}$

The effective resistance at 2 is

$\frac{1}{R_2}=\frac{1}{R_1+4}+\frac{1}{3}=\frac{3}{10+12}+\frac{1}{3}=\frac{31}{66}$

$\Rightarrow R_2=\frac{66}{31}$

And the total resistance is

$R=2+ R_2=\frac{66}{31}+2=4.13\ \Omega$