You are working in a laboratory over the summer and you measure the magnetic field in a coil to be 3T. You insert a steel rod which has a pole strength 500 A-m. The amount of force on the rod is
A) 0
B) 3 N
C) 1500 N
D) 1500 N-m

Question

Quizplus · Accepted Answer

The force on a magnetic dipole (such as a steel rod with a given pole strength) in a uniform magnetic field is given by the equation $F = pB$, where $p$ is the pole strength of the magnet and $B$ is the magnetic field strength. Here, $p = 500 \, \text{A-m}$ and $B = 3 \, \text{T}$, so the force $F = 500 \times 3 = 1500 \, \text{N}$.

You Are Working in a Laboratory Over the Summer and You