can any1 of u guys pls solve ques no-3.87 from the book of irodov.

plzzz ans quick and i would b gratefuk ig=f u could suggent any other book than h c verma for solving electricity problems..plzzz ans awaited@@@@

F-------->F'=F/epsilon

mg------>mg(1- (rho_0) /  (rho))

since th inclinations do not change

1/epsilon =1-(rho_0/rho)

=>(rho_0/rho)=1-1/epsilon

=>rho=(rho_0)*[epsilon/(epsilon-1)]

F'=force after suspending it in kerosin

halliday resnik walker.................or paul a tipler