Magnetic effect of electric current on a field due to 4 wires
"Consider the four current-carrying wires described in the figure below. Each of these wires is long and straight, and carries the current I either into or out of the page, as shown."
What is the direction of the net magnetic field produced by these four wires at the center of the square?
... (a) B2 - B4 = 0 ; 2nd and 4th coil with currents in opposite directions. ... Force problems related to magnetic effect of electric current are solved. ...
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