A laboratory sensor measures the magnetic field magnitude produced along the central…
PHYSICS · Multi-part · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A laboratory sensor measures the magnetic field magnitude produced along the central axis of a tiny cylindrical magnet that behaves as an ideal dipole. When the sensor is placed 5.0 cm from the center of the magnet, the reading is 4.2×10−4T.
(a) Calculate the expected sensor reading when it is moved to a distance of 10.0 cm from the center of the magnet along the same axis.
(b) Determine the percentage decrease in magnetic field magnitude resulting from the change in position.
(c) Briefly interpret what your calculation implies about how quickly magnetic dipole fields weaken with distance compared with the inverse-square weakening of the electric field of a point charge.