Question

Which law provides a simpler alternative method for finding the magnetic field \[B\] when the current distribution has symmetry (straight wire, solenoid, toroid)?

Options

• Gauss's Law

• Ampere's Circuital Law

• Biot–Savart Law

• Coulomb's Law

Answer 1

Ampere's Circuital Law gives \[\oint\vec{B}\cdot d\vec{l}=\mu_0 I\] in a single step when the current distribution possesses symmetry (straight wire, solenoid, toroid). The Biot–Savart Law is general but involves lengthy integration.