APFIVE Magnetic Field of a Long Straight Wire
A long, straight wire carries a current $$I$$ that increases at a constant rate $$\frac{dI}{dt}$$. What is the magnitude of the magnetic field $$B$$ at a distance $$r$$ from the wire?
A
$$B = \frac{\mu_0 I}{2\pi r} + \frac{\mu_0 \epsilon_0 r}{2} \frac{dE}{dt}$$
B
$$B = \frac{\mu_0 r}{2\pi} \frac{dI}{dt}$$
C
$$B = \frac{\mu_0 I}{2\pi r}$$
D
$$B = \frac{\mu_0 I}{2\pi r} - \frac{\mu_0 r}{4\pi} \frac{dI}{dt}$$
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