A test charge of +3 ?C is at a point P where the electric field due to other charges is directed to the right and has a magnitude of 4 x 106 N/C. If the test charge is replaced with a –3 ?C charge, the electric field at P
1.has the same magnitude as before, but changes direction.
2.increases in magnitude and changes direction.
3.remains the same.
4.decreases in magnitude and changes direction.
3
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Why does Saturn radiate even more excess heat than Jupiter?
A) Helium rain falling inward generates heat as it descends. B) Saturn's atmosphere contains much methane, which is very flammable. C) Only Saturn is still radiating heat left over from its formation. D) Saturn's thick clouds give it a stronger greenhouse effect. E) Saturn is more massive than Jupiter, so its gravitational compression is stronger.
The magnetic field of a long, straight wire has a value B0 at a distance of r0 when the current is I0. At a distance of 3.00 r0. what current is necessary to produce a field having the same strength B0 at this position?
1. 1.73 I0 2. 3.00 I0 3. 9.00 I0 4. More information is needed.
Describe how the different paths of polar wandering helped establish that continents move over geologic time
What will be an ideal response?
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates
A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.) A) Both the charge on the plates of the capacitor and its capacitance would change. B) The potential difference across the plates would increase. C) Only the charge on the plates of the capacitor would change. D) Nothing would change. E) Only the capacitance would change.