For a current carrying circular coil as we move towards the center from the circumference, the magnetic field strength

  1. Increases
  2. Decreases
  3. Remains constant
  4. May increase or decrease depending on direction of current in the loop.

Answer (Detailed Solution Below)

Option 1 : Increases
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Detailed Solution

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CONCEPT:

  • Biot Savart Law states that: The magnetic intensity (dB) at a point A due to current I flowing through a small element dl is Directly proportional to the current (I).
    F1 J.K Madhu 13.05.20 D4
  • The magnetic field at the center of the circular coil is given by
    \(B = \frac{{{\mu _o}}}{{2 }}\frac{I}{r}\)

          Where B = strength of the magnetic field, I = current, r = radius or distance

EXPLANATION:

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  • From above it is clear that the magnetic field due to the circular coil is inversely proportional to the distance.
  • As we move towards the center of the coil, the magnetic field strength increases. Therefore option 1 is correct.
  • This is because the two magnetic fields from either end assist each other.
  • The magnetic field is maximum at the center of the coil.
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