The magnetic field due to a long straight current-carrying conductor is independent of-

  1. the current through it
  2. length of the conductor
  3. distance from the conductor
  4. all of the above

Answer (Detailed Solution Below)

Option 2 : length of the conductor
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Electric charges and coulomb's law (Basic)
10 Qs. 10 Marks 10 Mins

Detailed Solution

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The correct answer is option 2) i.e. length of the conductor

CONCEPT:

  • Magnetic field due to a straight current-carrying conductor: Biot-Savart Law
    • ​Magnetic field B at a radial distance r, due to a wire carrying current is given by:

Where μ0 is the permeability of free space (4π × 10-7 Tm/A), and I is the current intensity.

EXPLANATION:

The magnetic field due to a long straight current-carrying wire is given by:

.

  • Magnetic field B is dependent on the current (I) and radial distance from the wire (r).
  • Therefore, the magnetic field is independent of the length of the conductor.

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