Three negative charges of equal magnitudes are positioned along the x-axis at x = -a, x=0, and x = +a respectively. The charge located at x=0 is moved away along the y-axis to a position (x,y) = (0, +a)
How does the potential energy of the system of charges change as a result? A)
The potential energy may increase or decrease depending on the magnitude of the charges.
B)
The potential energy increases.
C)
The potential energy decreases.
D)
The potential energy stays the same.
E)
More information is needed to answer the question.
C
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Faraday's Law: A single-turn loop of wire, having a resistance of 8.00 ? and a cross-sectional area 200 cm2, is perpendicular to a uniform magnetic field that increases steadily from 0.200 T to 2.800 T in 2.20 seconds. What is the magnitude of the induced current in the loop?
A. 2.95 A B. 3.18 A C. 0 A D. 3.18 mA E. 2.95 mA
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A series circuit consists of a 0.55-H inductor with internal resistance of 8.0 ? connected in series with a 4.0-? resistor, an open switch, and an ideal 12-V battery
(a) When the switch is closed, what is the initial current through the 4.0-? resistor? (b) What is the current through the 4.0-? resistor a very long time after the switch is closed?