Consider a circular loop of wire lying on the plane of a table. Let an electric current pass through the loop clockwise. The direction of the magnetic field inside is:

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ALP CBT 2 Physics and Maths Previous Paper 5 (Held On: 22 Jan 2019 Shift 2)
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  1. perpendicular to the plane of the table pointing into it
  2. always along the tangent to the loop in the same sense of flow of the current
  3. perpendicular to the plane of the table and appearing to emerge out from it
  4. always along the tangent to the loop opposite to the sense of flow of the current

Answer (Detailed Solution Below)

Option 1 : perpendicular to the plane of the table pointing into it
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Detailed Solution

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CONCEPT:

Right-hand thumb rule:

F1 Jayesh Deepak 07.04.2020 D2

  • Right-hand thumb rule states that if a current-carrying conductor is imagined to be held in the right hand such that the thumb points in the direction of the current, then the curled fingers indicate the direction of the magnetic field.
  • If the current flows in the upward direction the direction of the magnetic field is clockwise, then the direction facing will be the North Pole.
  • If the current flows in the downward direction the direction of the magnetic field is anticlockwise, then the direction facing will be the South Pole.

EXPLANATION:

Given - The current is passing through the loop in clockwise.

  • Since the current passes through the loop in the clockwise direction, therefore, the front face of the loop will be the south pole and the back face, i.e., the face touching the table will be north pole.
  • According to the right-hand rule, the direction of the magnetic field inside the loop will be pointing downward.
  • Outside the loop, the direction of the magnetic field will be upward
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