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concept questions a) uniform magnetic field do no work on point charges, why not? what about...

concept questions

a) uniform magnetic field do no work on point charges, why not?
what about electric field, changing electric field and changing magnectic field: Can they do work? how do u know?

b) what is the magnetic field outside of a uniformly charged, stationary copper wire on Earth?( though it is charged, it's not attached to any power supply)

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