Explain Magnetic Effects of Electric Current in physics

Updated on Jan. 8, 2021 03:25 PM IST by Lakshmi Arya

Magnetic Field Due to Current Through a Circular Loop

  1. It can be represented by concentric circle at every point.
  2. Circles become larger and larger as we move away.
  3. Every point on wire carrying current would give rise to magnetic field appearing as straight line at centre of the loop.
  4. The direction of magnetic field inside the loop is same.

Factors affecting magnetic field of a circular current carrying conductor

  1. Magnetic field ∝ Current passing through the conductor
  2. Magnetic field ∝ 1/ Distance from conductor
  3. Magnetic field ∝ No. of turns in the coil

Magnetic field is additive in nature i.e., magnetic field of one loop adds up to magnetic field of another loop. This is because the current in each circular turn has some direction

Solenoid

  1. A coil of many circular turns of insulated copper wire wrapped closely in a cylindrical form.
  2. Magnetic field of a solenoid is similar to that of a bar magnet.
  3. Magnetic field is uniform inside the solenoid and represented by parallel field lines.
  4. Direction of magnetic field (i) Outside the solenoid: North to South (ii) Inside the solenoid: South to North
  5. Solenoid can be used to magnetise a magnetic material like soft iron.
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