## Procedure: (for performing in lab)

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### Determination of moment of inertia using torsion pendulum with identical masses

- The radius of the suspension wire is measured using a screw gauge.
- The length of the suspension wire is adjusted to suitable values like 0.3m,0.4m,0.5m,.....0.9m,1m etc.
- The disc is set in oscillation.Find the time for 20 oscillations twice and determine the mean period of oscillation ' T
_{0 }'.
- The two identical masses are placed symmetrically on either side of the suspension wire as close as possible to the centre of the disc, and measure d
_{1} which is the distance between the centres of the disc and one of the identical masses.
- Find the time for 20 oscillations twice and determine the mean period of oscillation ' T
_{1 }'.
- The two identical masses are placed symmetrically on either side of the suspension wire as far as possible to the centre of the disc, and measure d
_{2} which is the distance between the centres of the disc and one of the identical masses.
- Find the time for 20 oscillations twice and determine the mean period of oscillation ' T
_{2 }'.
- Find the moment of inertia of the disc using the given formulae.

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##

## Observations:

Length of the suspension wire=................m

Radius of the suspension wire=..............m

Mass of each identical masses=.............kg

d_{1}=...........m

d_{2}=...........m

##

## Calculations:

T_{0 }= ........s

T_{1} = .........s

T_{2 }= .........s

###

Moment of inertia of the given disc,