The source of all magnetism is

A) tiny pieces of iron.
B) tiny domains of aligned atoms.
C) ferromagnetic materials.
D) moving electric charge.
E) none of the above


Answer: D

Physics & Space Science

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A muon formed high in the Earth's atmosphere travels at a speed 0.870c for a distance of 4.00 km before it decays. What is the muon's lifetime as measured in its reference frame?

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Indicate whether the statement is true or false

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An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 30 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder

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