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Two spheres A and B are charged with the...

Two spheres A and B are charged with the charges of +10 and +20 coulomb respectively and separated by a distance of 80 cm. The electric field at point on the line joining the centres of the two spheres will be zero at a distance from the sphere A :

A

20 cm

B

33 cm

C

45 cm

D

60 cm

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