MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

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.

Open in App

Solution

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

Suggest Corrections

thumbs-up

0

Similar questions

Q. 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 torsional constant if current

i_{0}

produces angular deflection of

π / 2

C = \frac{x N B A i_{0}}{π}

Q. 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.
A charge Q is passed almost instantaneously through coil.

If the maximum angular deflection in it is

θ = Q \sqrt{\frac{π N A B}{x I i_{0}}}

Q. A moving coil galvanometer has a coil of effective area

A

and number of turns

N

. The magnetic field

B

is radial. If a current

I

is passed through the coil, the torque acting on the coil is.

Q. A moving coil galvanometer experience Torque

= k i

i

N

coils of area A each and moment of inertia I is kept in magnetic field B.
(a) find

k

in terms of given parameters,
(b) if for current

i

\frac{π}{2}

, find out torsional constant of spring,
(c) if a charge

Q

is passed suddenly through the galvanometer find out maximum angle of deflection

Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.

Moving coil galvanometers are of two types
(a) Suspended coll
(b) Pivoted coil type or tangent galvanometer,

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

$(i v)$ In a moving coil galvanometer, having a coil of $N$ -turns of area $A$ and carrying current $I$ is placed in a radial field of strength $B$ . The torque acting on the coil is

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Eddy Currents

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon