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## GR0877 Problem 38

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (E) Magnetic field at distance a from a wire carrying a current $I$ is $\displaystyle B = \frac{\mu_0 I}{2\pi a}$. From the picture (and right-hand rule) it is obvious that the magnetic field at point $P$ due to the horizontal wire has the same magnitude, but opposite direction, than of the magnetic field at this point due to the vertical wire. Thus, the net magnetic field is zero.

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