Class 12PhysicsMoving Charges and MagnetismAmpere’s circuital law and its application (Solenoid and Toroid)
Medium$A$ long straight wire of circular cross-section (radius $a$) is carrying steady current $I$. The current $I$ is uniformly distributed across this cross-section. The magnetic field is
- AZero in the region $r < a$ and inversely proportional to $r$ in the region $r > a$
- BInversely proportional to $r$ in the region $r < a$ and uniform throughout in the region $r > a$
- CDirectly proportional to $r$ in the region $r < a$ and inversely proportional to $r$ in the region $r > a$
- DUniform in the region $r < a$ and inversely proportional to distance $r$ from the axis,in the region $r > a$
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