Charge A and charge B are 3.00 m apart, and charge A is +2.00 C and charge B is +3.00 C. Charge C is located between them at a certain point and the force on charge C is zero. How far from charge B is charge C?
a. 1.35 m
c. 1.65 m
b. 0.667 m
d. 0.555 m
C
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A long straight metal rod has a radius of 2.0 mm and a surface charge of density 0.40 nC/m2 . Determine the magnitude of the electric field 3.0 mm from the axis
a. 18 N/C b. 23 N/C c. 30 N/C d. 15 N/C e. 60 N/C
Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
A. conservation of angular momentum B. conservation of linear momentum C. conservation of energy D. the law of universal gravitation E. conservation of mass
When a light bulb is turned on, its resistance increases until it reaches operating temperature. What happens to the current in the bulb as it is warming up?
a. It stays constant. b. It increases. c. It decreases. d. It increases at first and then decreases.
RC Circuits: A fully charged 37-µF capacitor is discharged through a 1.0-k? resistor. If the voltage across the capacitor is reduced to 7.6 volts after just 20 ms, what was the original potential across the capacitor?
A. 16 V B. 13 V C. 11 V D. 9.0 V E. 8.0 V