AP EAMCET · PHYSICS · Magnetic Effects of Current
A wire of length \(l\) is bent into a circular loop of radius \(R\) and carries a current \(I\). The magnetic field at the centre of the loop is \(B\). The same wire is now bent into a double loop of equal radii. If both loops carry the same current \(I\) and it is in the same direction, the magnetic field at the centre of the double loop will be
- A Zero
- B 2 B
- C 4 B
- D 8 B
Answer & Solution
Correct Answer
(A) Zero
Step-by-step Solution
Detailed explanation
Magnetic field at the centre of the loop \(B=\frac{\mu_0}{4 \pi} \cdot \frac{I \cdot 2 \pi R}{R^2}\) ...(i) For the wire which is looped double let radius becomes \(r\) Then, \(\begin{aligned} \frac{l}{2} & =2 \pi r \\ \text{or} \quad \frac{l}{4 \pi} & =(r) \end{aligned}\)…
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