Which statement best describes the magnetism shown by a paper clip when it is attracted to a bar magnet close by? A. It occurs when it's near another magnet.
It's always occurring.
C. It occurs when there is an electric current
D. It occurs when touching another magnet.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

Frequency of electromagnetic waves that a radio station is assigned is called

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?