To understand how to use the principle of superposition in conjunction with the

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To understand how to use the principle of superposition in conjunction with the Biot - Savart (or Ampere's) law. From the Biot - Savart law, it can be calculated that the magnitude of the magnetic field due to a long straight wire is given by B_vec.) B_vec can be found using the right - hand rule. (Take care in applying the right - hand rule. Many students mistakenly use their left hand while applying the right - hand rule since those who use their right hand for writing sometimes automatically use their pencil - free hand to determine the direction of d is the distance from the wire to the location at which the magnitude of the magnetic field is being calculated. The same result can be obtained from Ampere's law as well. The direction of vector I is the current in the wire, and !=!4pi times 10^{ - 7}; T cdot m/A) is the permeability constant, mu_0 (B_{wire}=frac{mu_0 I}{2pi d} , where

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