Question:
If reduction factor of a tangent galvanometer is $900 \,mA$, then the current through it to produce a deflection of $ 45^{\circ} $ is
If reduction factor of a tangent galvanometer is $900 \,mA$, then the current through it to produce a deflection of $ 45^{\circ} $ is
Updated On: Jun 23, 2023
- 600 mA
- 700 mA
- 750 mA
- 900 mA
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The Correct Option is D
Solution and Explanation
Current $(I)$ flowing in a tangent galvanometer is given by
$I=k \tan \theta \text {. }$
Given, $k$ is reduction factor
$\left(k=900 mA =900 \times 10^{-3} A \right), \theta=45^{\circ} $
$\therefore I=900 \times 10^{-3} \times \tan 45^{\circ} $
$\Rightarrow I=900 \,mA$
$I=k \tan \theta \text {. }$
Given, $k$ is reduction factor
$\left(k=900 mA =900 \times 10^{-3} A \right), \theta=45^{\circ} $
$\therefore I=900 \times 10^{-3} \times \tan 45^{\circ} $
$\Rightarrow I=900 \,mA$
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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.