Acharged wire of negligible thickness has length 2l units and has a linear charge density λ. consider the electric field e-vector at the point p, a distance d above the midpoint of the wire. the field e-vector points along one of the primary axes, ywhat is the magnitude e of the electric field at point p? throughout this part, express your answers in terms of the constant k, defined by k=1/(4πε)

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2