In: Physics
1.
We have a hollow metallic sphere with charge -5.0 uC and radius 5.0 cm. We insert a +10uC charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
+5 uC |
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+10 uC |
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+15 uC |
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-5 uC |
A free electron is in an electric field. With respect to the field, it experiences a force acting:
Parallel |
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Anti-parallel |
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Perpendicular |
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Along a constant potential line |
A parallel plate capacitor has a capacitance of 20 uF. What charge on each plate will produce a potential difference of 36 V between the plates of the capacitor?
7.2 x 10-4 C |
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3.6 x 10-4 C |
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1.8 x 10-4 C |
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0.9 x 10-4 C |
What is the intensity of sound from a band with a sound level of 120 dB? (Io = 10-12 W/m2)
1 W/m2 |
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1.2 W/m2 |
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10 W/m2 |
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12 W/m2 |
Replacing a wire resistor with another of the same material and length but with three times the diameter will have the effect of changing the resistance by what factor?
0.33 |
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1/9 |
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3 |
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9 |