A circuit contains two resistors in series. The voltage drop across the first is 10 V. The voltage drop across the second is also 10 V. What is the voltage provided by the power supply in this circuit

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.