40. (a) How large a current would a very long. Straight wire have to carry so th

Question

40. (a) How large a current would a very long. Straight wire have to carry so that the magnetic field 2.00 cm from the wire is equal to 1.00 G (comparable to the earths northward-pointing magnetic field)? (b) 1f the wire is horizontal with the current running from cast to west, at what locations would the magnetic field of the wire point in the same direction as the horizontal component of the earth?s magnetic field? (c) Repeat part (b) except with the wire vertical and the current going upward.

Explanation / Answer

a) we know, 1 G = 10^-4 t

Apply, B = mue*I/(2*pi*d)

I = B*2*pi*d/(mue)

= 10^-4*2*pi*0.02/(4*pi*10^-7)

= 20 A

b) at upper point

c) at a point east ward from the wire

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