Categories > Moving Charges and Magnetism > Biot-Savart's Law > The magnetic field at the centre of a circular coil of radius r carrying current $I$ is${B_1}$. The field at the centre of another coil of radius $2r$ carrying same current $I$ is${B_2}$. The ratio $\frac{{{B_1}}}{{{B_2}}}$ is

Moving Charges and Magnetism

Question: The magnetic field at the centre of a circular coil of radius r carrying current $I$ is${B_1}$. The field at the centre of another coil of radius $2r$ carrying same current $I$ is${B_2}$. The ratio $\frac{{{B_1}}}{{{B_2}}}$ is


1) $\frac{1}{2}$
2) $1$
3) $2$
4) $4$
Solution: Explanation: No Explanation
Biot-Savart's Law Amperes Law

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