A very short solenoid contains N = 20 circular loops of wire.The radius of the loop is R = 0.5 meters,and the length of the solenoid is d = 0.02 meters.Approximately what is the magnetic field in the center of the solenoid? A)µ_oN I/d B)µ_oN I/(2R) C)µ_oN I/(2dR) D)µ_oN I/(2pR)

Question

Quizplus · Accepted Answer

The magnetic field in the center of a solenoid can be approximated by the equation B = µN*I/(2R), where N is the number of loops, I is the current, R is the radius of the loops, and µ is the permeability of free space. Plugging in the given values, we get B = 4π*10^-7 * 20*I/(2*0.5) = 2.5*10^-5 I T. Thus, the magnetic field in the center of the solenoid is proportional to the current, and the correct choice is B, which matches this formula.

A Very Short Solenoid Contains N = 20 Circular Loops