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Q. In each cycle of its operation, a refrigerator removes 10 J of heat from the inside of the refrigerator and releases 38 J of heat into the room. How much work per cycle is required to operate this refrigerator?

Q. A hollow cylinder of radius r and height h has a total charge q uniformly distributed over its surface. The axis of the cylinder coincides with the z axis, and the cylinder is centered at the origin.

To get the result into the final form, it is useful to remember that ln(x2)=2ln(x).

What is the electric potential V at the origin?

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Category:- Physics
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