The figure shown is the schematic representation of Cavendish's experiment to determine the valu...

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The figure shown is the schematic representation of Cavendish's experiment to determine the value of the gravitational constant. The bar \( A B \) has two small lead spheres attached at its ends. The bar is suspended from a rigid support by a fine wire. Two large lead spheres are brought close to the small ones but on opposite sides as shown.
The big spheres attract the near by small ones by a force which is
(a) equal and opposite
(b) equal but in same direction
(c) unequal and opposite
(d) None of the above
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