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An electric bus operates by drawing current from two parallel overhead cables, at a potential difference...

An electric bus operates by drawing current from two parallel overhead cables, at a potential difference of 600 V, and spaced 51 cm apart. When the power input to the bus’s motor is at its maximum power of 90 hp , what current does it draw? When the power input to the bus’s motor is at its maximum power of 90 hp , what is the attractive force per unit length between the cables?

A circular metal loop is 28.0 cm in diameter. How large a current must flow through this metal so that the magnetic field at its center is equal to the earth's magnetic field of 5.00×10−5 T ?

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