Consider a tightly wound $100$ turn coil of radius $10 \; cm$,carrying a current of $1 \; A$. What is the magnitude of the magnetic field at the centre of the coil?
- A$1.26 \times 10^{-3} \; T$
- B$9.42 \times 10^{-4} \; T$
- C$6.28 \times 10^{-4} \; T$
- D$3.14 \times 10^{-4} \; T$
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