What is Tangent Galvanometer? Explain briefly.
What are the possible conceptual questions from the chapter Magnetism & Matter?
Asked by debjyotisaha98 | 22nd Aug, 2015, 12:11: PM
Expert Answer:
Tangent galvanometer is an instrument for measuring small electric currents. With it one can measure the horizontal component of Earth's magnetic field also. It consists of a coil of insulated copper wire wound on a circular non-magnetic frame. Its working is based on the principle of the tangent law of magnetism B = Bh tanθ.
When a current is passed through the circular coil, a magnetic field (B) is produced at the centre of the coil in a direction perpendicular to the plane of the coil. The TG is arranged in such a way that the horizontal component of Earth’s magnetic field (Bh) is in the direction of the plane of the coil.
The magnetic needle is then under the action of two mutually perpendicular fields. If θ is the deflection of the needle, then according to tangent law, we get
This is how, one can measure the horizontal component of Earth's magnetic field.
NOTE: Kindly post the other question as a separate query.
Answered by Romal Bhansali | 22nd Aug, 2015, 08:15: PM
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