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Q. A piece of Nichrome wire has a radius of 5.50 10-4 m. It is used in a laboratory to make a heater that dissipates 3.00x 10^2 W of power when connected to a voltage source of 120 V. Ignoring the effect of temperature on resistance, estimate the necessary length of wire.

Q. Two identical point charges are fixed distance from one another. If one of their charges was doubled an the other was halved, how would the electric force be affected?

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