Two spheres of same mass and radius are in contact with each other....

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Two spheres of same mass and radius are in contact with each other. If the moment of inertia of a sphere about its diameter is \( I \), then the moment of inertia of both the spheres about the tangent at their common point would be -
(1) \( 3 I \)
(2) \( 7 I \)
(3) \( 4 I \)
(4) \( 5 I \)
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