Why is “soft” iron used for the core of an electromagnet? it is a permanent magnet. it is difficult to magnetize. it has no magnetic domains. it is easily magnetized.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.