If two electrons are near each other and are moving past each other, the electromagnetic forces they exert on each other will be
A) magnetic but not electric. B) electric but not magnetic.
C) zero. D) both electric and magnetic.
D
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RC Circuits: For the circuit shown in the figure, C = 12 µF and R = 8.5 M?. Initially the switch S is open with the capacitor charged to a voltage of 80 V. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor, when the current in the circuit is 3.3 µA?
A. 350 µC B. 340 µC C. 480 µC D. 620 µC E. 700 µC
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
a.
Zero
b.
IBL in the +z direction
c.
IBL in the ?z direction
d.
1.7 IBL in the +z direction
e.
1.4 IBL in the ?z direction
A 1.2-m high by 2.8-m wide vertical rectangular gate is used to control the flow of water from a reservoir to a grinding mill. A frictionless hinge runs along the bottom of the gate. The minimum force acting normal to and at the very top of the gate needed to hold the gate shut if the water is at the very top of the gate is nearest:
(A) 6590 N (B) 9800 N (C) 10 000 N (D) 13 300 N
A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 31 cm?
A) 199 N B) 91.0 N C) 145 N D) 279 N