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```				   sir please explain what exactly perpendicular and parallel axis theorem
```

5 years ago

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```										Dear Simran

parallel axis theorem:
The moment of inertia about the  axis z is given by:
$I_z = I_{cm} + mr^2,\,$
where:
$I_{cm}\!$ is the moment of inertia of the object about an axis passing through its centre of mass and parallel to the z axis;$m\!$ is the object's mass;$r\!$ is the perpendicular distance between the two axesperpendicular axis theorem:
The perpendicular axis theorem states that if body lies in XY plane then                                                       IZ = IX + IYwhere,

IX be the moment of inertia of the body about the X axis;
IY be the moment of inertia of the body about the Y axis; and
IZ be the moment of inertia of the body about the Z axis

The 3 axis X, Y and Z are mutually perpendicular to each other

Please  feel free to post as many doubts on our discussion forum as you can. We  are all IITians and here to help you in your IIT JEE preparation.
Win exciting gifts by answering the questions on Discussion Forum. So help discuss any  query on askiitians forum and become an Elite Expert League askiitian.

```
5 years ago

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