COMEDK · Physics · 21. Magnetic Effects of Current
The magnetic field at the centre of a wire loop formed by two semicircular wires of radii \(r_1\) = 3.14m and \(r_2\) = 6.28m and carrying a current of I =2A is:
- A \(3 \times 10^{-7}\ T\)
- B \(6 \times 10^{-7}\ T\)
- C \(4 \times 10^{-7}\ T\)
- D \(2 \times 10^{-7}\ T\)
Answer & Solution
Correct Answer
(A) \(3 \times 10^{-7}\ T\)
Step-by-step Solution
Detailed explanation
The magnetic field at the centre of the loop is the vector sum of the magnetic fields produced by the four segments of the wire: two straight segments and two semicircular arcs. For the straight segments, the line of action of the current passes through the centre of the loop.…
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