Moving Charges and Magnetism

Question: The magnetic field $d\vec B$ due to a small current element $d\vec l$ at a distance $\vec r$ and element carrying current i is,

1) $\vec{dB} = \frac{\mu_0}{4\pi}i(\frac{\vec{dl} \times \vec r}{r})$

2) $\vec{dB} = \frac{\mu_0}{4\pi}i^2 (\frac{\vec{dl} \times \vec r}{r})$

3) $\vec{dB} = \frac{\mu_0}{4\pi}i^2 (\frac{\vec{dl} \times \vec r}{r^2})$

4) $\vec{dB} = \frac{\mu_0}{4\pi}i(\frac{\vec{dl} \times \vec r}{r^3})$

Solution:

Explanation: No Explanation

Biot-Savart's Law Amperes Law

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