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ICSE Class 10 Physics Question 13 of 136

Electro-magnetism — Question 3

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Question

Question 3

In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be :

In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be : Electromagnetism, Concise Physics Solutions ICSE Class 10.
  1. straight lines
  2. concentric circles
  3. elliptical lines
  4. squares
Answer

concentric circles

Reason — According to the right hand thumb rule, with current passing downward through the cardboard, if we imagine wrapping our right hand around the wire with our fingers pointing downwards, our thumb will point in the direction of the magnetic field lines.

Hence, magnetic field lines would form concentric circles around the wire.