If you were to travel parallel to an infinitely long straight wire with current

Question

If you were to travel parallel to an infinitely long straight wire with current I at the same velocity as the electrons in the wire at a distance a from the wire, the magnitude of the magnetic field (according to your measuring instruments) would be

0.

a.

0.

b.

.

c.

.

d.

.

e.

.

If you were to travel parallel to an infinitely long straight wire with current I at the same velocity as the electrons in the wire at a distance a from the wire, the magnitude of the magnetic field (according to your measuring instruments) would be a. 0. b. . . e. . d. . c.

Explanation / Answer

The magnetic field due to straight conduct wire is,

        B = B1 + B2 = u0I/2(pi)a - u0I/2(pi)a = 0

Hence, option (a) is correct.

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