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Using the forumlae $\rm \vec{F} = q \vec{V} \times \vec{B}$ and $\rm B = \frac{\mu_{o} i}{2 \pi r}$, show that the SI units of the magnetic field B and the permeability constant $\rm \mu_{o}$ may be written as $\rm NmA^{-1}$ and $\rm NA^{-2}$ respectively.
A current of 10 A is established in a long wire along the positive z-axis. Find the magnetic field $\rm \vec{B}$ at the point (1m, 0, 0).
A copper wire of diameter 1.6 mm carries a current of 20 A. Find the maximum magnitude of the magnetic field $\rm \vec{B}$ due to this current.
A transmission wire carries a current of 100 A. What would be the magnetic field B at a point on the road if the wire is 8m above the road?
A long, straight wire carrying a current of 1.0 A is placed horizontally in a uniform magnetic field B = $\rm 1.0 \times 10^{-5}$ T pointing vertically upward (figure 35-E1). Find the magnitude of the resultant magnetic field at the points P and Q, both situated at a distance of 2.0 cm from the wire in the same horizontal plane.