Question:

The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.

Updated On: Jun 23, 2023
  • If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  • If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
  • If Assertion is correct but Reason is incorrect
  • If both the Assertion and Reason are incorrect
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The Correct Option is C

Solution and Explanation

Sensitivity of galvanometer, $s = \frac{\theta}{i} \simeq \frac{\tan \theta}{i} = \frac{\mu_0 N}{2 R B_H}$ If a magnetic material is placed inside coil of galvanometer, then $s' = \frac{\mu_r \mu_0 N}{2RB_H}$
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Notes on Magnetism and matter

Concepts Used:

Magnetism & Matter

Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.

Magnetite is the world’s first magnet. This is also called a natural magnet.  Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.

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Some of the properties of the magnetic field lines are:

  • The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
  • They form closed loops traversing inside the magnet. 
  • But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
  • More number of close lines indicate a stronger magnetic field
  • The lines do not intersect each other
  • The tangent drawn at the field line gives the direction of the field at that point.