The graph shows magnetic-field magnitude B versus radial distance r for four long wires a, b, c and d, each carrying uniformly distributed current over its cross-section.
Physics · Magnetic effect of current
The graph shows magnetic-field magnitude B versus radial distance r for four long wires a, b, c and d, each carrying uniformly distributed current over its cross-section.
Sub-question 1
Which wire has the greatest radius?
Options
Sub-question 2
The current density in wire a is:
Options