For the circuit shown, which equation is correct for the loop 1: a. E_1 + R1I_1

Question

For the circuit shown, which equation is correct for the loop 1: a. E_1 + R1I_1 + E_2 - R_2 I_2 = 0 b. E_1 + R_1I_1 - E_2 + R_2I_2 = 0 c. E_1 - R_1I_1 - E_2 - R_2 I_2 = 0 d. E_1 + R_1 I_1 + E_2 + R_2 I_2 = 0 e. -E_1 + R_1 I_1 - E_2 + R_2I_2 = 0 The switch S is initially at position b for a long time. It is then switched to position a. Describe what happens to the light bulb as a function of time when the switch is flipped from b to a? a. the light bulb was on but goes off immediately b. the light bulb was off and stays off c. the light bulb was on but its brightness decreases with time and eventually goes off d. the light bulb was on and stays on e. the light bulb was off. It then lights up but the brightness decreases with time and eventually goes off An uncharged capacitor and a resistor are connected in series to a battery as shown. If epsilon = 15 V, C = 20 mu F, and R = 4.0 times 10^5 Ohm, the charge on the capacitor as a function of time is a. Q(t) = 600 (1 - e^-0.125 t) mu C b. Q(t) = 300 (1 - e^-0.250 t) mu C c. Q(t) = 300 (1 - e^-0.125 t) mu C d. Q (t) = 600 (1 - e^-0.250 t) mu C e. Q(t) = 150 (1 - e^-0.750 t) mu C Assume that a uniform magnetic field is directed out of this page. If a positive charge is released with an initial velocity directed from the right to the left of the page, which of the following describes the direction of the resultant force acting on the electron? a. out of the page b. to the top of the page c. to the bottom of the page d. into the page e. other

Explanation / Answer

9.

Apply the loop rule to the loop 1, we get the following relation:

E1 - I1R1 - I2R2 - E2 = 0

E1 - I1R1  - E2 - I2R2 = 0

Option c is correct answer.

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