In a laboratory experiment the same straight wire is used in two different…
MATHEMATICS · Multi-part · ISC · Physics · Magnetic Effects of Current and Magnetism · Force on moving charges
Problem
In a laboratory experiment the same straight wire is used in two different orientations within the same uniform magnetic field of strength 0.40T. In the first trial the wire is held perpendicular to the field and a current of 10A produces a measured force of 0.32N. In the second trial the wire is rotated to an unknown angle and the current is changed to 6.0A, giving a measured force of 0.12N. Answer the following:
(i) Calculate the length of the wire that lies inside the magnetic field.
(ii) Calculate the angle between the wire and the magnetic field in the second trial.