Moving Charges and Magnetism Problems - Numerical 05

A long straight wire carries a current of 4A. What is the magnetic field at a point distant 10cm from the wire?

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Suggested solution:

The figure shows a long straight wire carrying current and point P where the field is to be obtained.

OP = a = 0.1m. The magnetic field B is

B = m_o I/2 a

= (4 x 10^-⁷x 4) 2 x 10 ^-¹

= 8 x 10^-⁶ T

According to the right-hand screw rule, the field is perpendicular to the plane of page and is directed away from the reader. It is represented as q.