The strength of the magnetic field around a current-carrying wire is given by the equation

PHYSICS · Multi-part · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current

Problem

The strength of the magnetic field around a current-carrying wire is given by the equation B=μ0I2πrB = \mu_0 \frac{I}{2\pi r} , where BB is the magnetic flux density (a measure of the magnetic field strength), μ0\mu_0 is the permeability of free space—air or a vacuum—( μ0=4π×10−7 TmA−1\mu_0 = 4\pi \times 10^{-7} \text{ TmA}^{-1} ) and rr is the perpendicular distance from the wire. (a) In what units is BB measured? (b) Determine the magnetic field strength in the following situations: - i 5.0 cm from a current of 120 mA - ii 8.0 cm from a current of 2 A - iii 25 cm from a current of 0.5 A

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