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Tangent Galvanometer...

Tangent Galvanometer

A

capacitance

B

current

C

resistance

D

potential difference

Text Solution

Verified by Experts

The correct Answer is:
B
When a current is passed through the galvanometer coil, then a magnetic field B is produced at right angles to the plane of the coil, ie, at right angles to the horizontal component of earth's magnetic field H. Under the influence of two crossed magnetic fields B and H, the magnetic needle of galvanometer undergoes a deflection `theta` which is given by the tangent law. Using tangent law, we can find a relation `I alpha tan theta`
Which clearly indicates that tangent galvanometer is an instrument used for detection of electric current in a circuit.
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A battery of emf 12 V and internal resistance 2Omega is connected in series with a tangent galvanometer of resistance 4Omega . The deflection is 60^@ when the plane of the coil is along the magnetic meridian . To get a deflection of 30^@ , the resistance to be connected in series with the tangent galvanometer is

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