-1 3. A ball of copper of specific heat capacity 400j kg k weighting 400 gm is' tansferred from a furnance to 1 kg of water at 10°c . The temp of water rise to 50°c. What is the original temp of the ball?

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.