Practicing Success
Case : Read the passage and answer the question(s). Magnetic Field of a hollow wire with a constant current is homogenous. Curves in the graph shown, give, as functions of distance r, the magnitude B of the magnetic field inside and outside four long wires a, b, c and d carrying currents that are uniformly distributed across the cross sections of the wires. Overlapping portions of the plots are indicated by double labels. |
What is true about the current density in wire a ? |
greater that that of wire c less than that of wire c equal to that of wire c not comparable to that of wire c due to lack of information |
greater that that of wire c |
slope is inversely proportional to square of the radius and directly proportional to current density. |