Two point charges 2.4 and 6.50 are 0.10 apart. point is, Ask an Expert

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Q. Two point charges 2.40 and 6.50are 0.100 apart. Point is midway between them; point is 8.00×10-2 from and 6.00×10-2 from . Take the electric potential to be zero at infinity. Find the work done by the electric field on a charge of 2.50 that travels from point to point .

Q. A slide projector needs to create a 91 cm high image of a 2.0 cm tall slide. The screen is 250 cm from the slide. Assume that it is a thin lens.
(a) What focal length does the lens need?
(b) How far should you place the lens from the slide?

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