Does anyone know how to solve Question 11 of Chapter13?... I can not simply writ

Question

Does anyone know how to solve Question 11 of Chapter13?...
I can not simply write the question here...There is a diagraminvolved...I do not know how to draw that diagram here...So ifsomeone has the book...or can possibly look up this question fromsomewhere...and knows how to solve it...Pls provide me with thestep by step solution ASAP Thanks... Does anyone know how to solve Question 11 of Chapter13?...
I can not simply write the question here...There is a diagraminvolved...I do not know how to draw that diagram here...So ifsomeone has the book...or can possibly look up this question fromsomewhere...and knows how to solve it...Pls provide me with thestep by step solution ASAP Thanks...

Explanation / Answer

gravitational force on the mass kept at thecenter=GMm/r2 using this formula we have to calculate the force on the mass keptat the center due to the masses kept ate edges of tyhetriangle. here the center is equidistant from the corners. part a) as per the data the net force on the central sphere=0 means thatthe force due to every sphere on the central one should beequal. then the M=m part b) when we double the mass at the center the force due to threespheres on it will again be zero due to symmetry. so answers for a)M=m b) 0

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