A moving coil galvanometer has a coil of area A and number of turns N- A magnetic field B is applied on it- The torque acting on it is given by -ki where i is current through the coil- If moment of inertia of the coil is I about the axis of rotation-If the value of k in terms of galvanometer parameters N- B- A is given by k-x- NBA- Find x-

The torque acting on the coil of moving coil galvanometer is: #160; τ=NiAB Given: τ=ki ki=NiAB⇒ k=NBA ...

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Standard XII

Physics

Eddy Currents

A moving coil...

Question

A moving coil galvanometer has a coil of area A and number of turns N. A magnetic field B is applied on it. The torque acting on it is given by $τ = k i$ where i is current through the coil. If moment of inertia of the coil is I about the axis of rotation.
If the value of k in terms of galvanometer parameters (N, B, A) is given by $k = x \times N B A$ . Find x.

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Solution

The torque acting on the coil of moving coil galvanometer is: $τ = N i A B$
Given: $τ = k i$
$k i = N i A B \Rightarrow k = N B A$

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The torque acting on the coil of moving coil galvanometer is: τ=NiABGiven: τ=kiki=NiAB⇒k=NBA

The torque acting on the coil of moving coil galvanometer is: $τ = N i A B$
Given: $τ = k i$
$k i = N i A B \Rightarrow k = N B A$