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Chapter 25: Q. 21 (page 710)
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An electric dipole has dipole moment p. If r W s, where
s is the separation between the charges, show that the electric
potential of the dipole can be written
where r is the distance from the center of the dipole and u is the
angle from the dipole axis.
Two plates that form a parallel-plate capacitor are charged to 0.708 nC. What are the electric field strength inside and the potential difference across the capacitor if the spacing between the plates is (a) 1.00 mm and (b) 2.00 mm?
FIGURE P25.69 shows a thin rod of length L and charge Q. Find an expression for the electric potential a distance x away from the center of the rod on the axis of the rod.
Two spherical drops of mercury each have a charge of and a potential of at the surface. The two drops merge to form a single drop. What is the potential at the surface of the new drop?
A proton is released from rest at the positive plate of a parallelplate capacitor. It crosses the capacitor and reaches the negative plate with a speed of 50,000 m/s. What will be the final speed of an electron released from rest at the negative plate?
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