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A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of, the magnetic induction at the centre due to the current in the ring is?
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A battery is connected between two points A and B on the circumference...
Introduction
When a battery is connected between two points A and B on a uniform conducting ring, it creates a current that flows through the ring. The magnetic field at the center of the ring can be calculated using Ampère's law and the Biot-Savart law.

Magnetic Field Due to a Current-Carrying Ring
- The total current \(I\) flowing through the ring is given by Ohm's law:
\[
I = \frac{V}{R}
\]
where \(V\) is the voltage of the battery and \(R\) is the total resistance of the ring.
- The arc AB subtends an angle \(\theta\) at the center. The fraction of the total circular loop corresponding to this angle is:
\[
\frac{\theta}{2\pi}
\]
- Therefore, the effective length of the arc AB is:
\[
L = r\theta
\]

Magnetic Induction at the Center
- The magnetic field at the center of the ring due to the entire loop can be expressed as:
\[
B = \frac{\mu_0 I}{2r}
\]
where \(\mu_0\) is the permeability of free space.
- For the arc AB, the magnetic induction can be calculated as:
\[
B_{AB} = \frac{\mu_0 I}{4\pi r} \cdot \theta
\]
- Substituting \(I\) from Ohm’s law:
\[
B_{AB} = \frac{\mu_0 V \theta}{4\pi R r}
\]

Conclusion
Thus, the magnetic induction at the center of the conducting ring due to the current is:
\[
B = \frac{\mu_0 V \theta}{4\pi R r}
\]
This equation encapsulates the relationship between the induced magnetic field, voltage, resistance, and the geometry of the ring.
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A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of, the magnetic induction at the centre due to the current in the ring is?
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