Suppose electrons move through a copper wire at speed v. Call the linear charge densities in the
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Question:
Suppose electrons move through a copper wire at speed v. Call the linear charge densities in the Earth reference frame λEp for the fixed positive ions in the wire and λEn for the (negative) electrons. Observer E in the Earth reference frame (which is also the reference frame of the positive ions) measures the wire to be electrically neutral. Observer M is moving along with the electrons (in the same direction as the electrons and at speed v).
A) Calculate the linear charge density of the wire as measured by M in terms of λEn if the speed is 4.5 ×105m/s. λM / λEn = ?
B) Calculate the linear charge density of the wire as measured by M in terms of λEn if the speed is 7.5 mm/s (an achievable speed for electrons in copper wire). λM / λEn = ?
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