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Homework Statement Two charged conducting spheres of radii a and b are connected to each other by a wire. What is the ratio of electric fields at the surfaces of the two spheres? Use the result obtained to explain why charge density on the sharp and pointed ends of a conductor is higher than on...

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we write \frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2} where R is the equivalent resistance of R_1 and R_2. Let there is an error in the measurements of R_1 and R_2 of \pm \Delta R_1 and \pm \Delta R_2 respectively. Is it correct that \frac{\Delta R}{R^2}=\frac{\Delta...

The ampere is that constant current which , if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 × 10 ^{–7} Newton per...