Physics – 4.5.5 The d.c. motor | e-Consult

The magnetic turning effect on a coil is directly proportional to the strength of the magnetic field. This is because the magnetic force on a single loop of wire is given by F = BIlsinθ, where B represents the magnetic field strength.

As the magnetic field strength B increases, the magnitude of the magnetic force on each loop of wire increases proportionally. This increased force results in a greater torque being applied to the coil, leading to a larger turning effect. Therefore, increasing the magnetic field strength will increase the magnetic turning effect.