Q1 metal rod is 41126 long at 230 and 41149 long at 464, Ask an Expert

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Q1. Metal rod is 41.126 long at 23.0 and 41.149 long at 46.4 Calculate the average coefficient of linear expansion of the rod's material for this temperature range?

Q2. A metal sphere with radius r_a = 1.10 cm is supported on an insulating stand at the center of a hollow, metal, spherical shell with radius r_b = 9.50 cm. Charge +q is put on the inner sphere and charge - q on the outer spherical shell. The magnitude of q is chosen to make the potential difference between spheres 430 V, with the inner sphere at higher potential. Compute q.

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