<p>At this moment, my leg is 1.2 m away from a power cord carrying 2.8 Amps of c

Question

<p>At this moment, my leg is 1.2 m away from a power cord carrying 2.8 Amps of current. How does the magnetic field created by this wire compare to the Earth's magnetic field of 0.5 G (5 x 10^-4 T)?</p>
<p>a. More than a factor of 10 smaller that Earth's magnetic field</p>
<p>b. More than a factor of 10 larger than Earth's magnetic field</p>
<p>c. A similar order of magnitude</p>
<p>d. GOODNESS NO, GET OUT OF THERE! THAT FIELD IS LETHAL!</p>
<p>Please show steps to solve.</p>

Explanation / Answer

Data: Distance, r = 1.2 m Current, i = 2.8 A Earth magnetic field, Be = 0.5 G                                           = 0.5 x 10^-4 T Solution: Magnetic field due to wire, B = (o / 2) (i/r)                                                    = 2 x 10^-7 * (2.8 /1.2)                                                    = 4.67 x 10^-7 T B/Be = 4.67 x 10^-7 / 0.5 x 10^-4           = 9.34 x 10^-3 Ans: Option-a

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