Recent content by divr

Fig1 shows an arrangement of five particles with masses M1 = 10.0 Kg, M2=M3=M4=M5=2.5 Kg and with r = 4 cm. For what angle (in degrees) of the net gravitational force F on particle 1 due to other particles cancels out. a)30 b) 45 c) 90 d) 0 (figure is given in the attachment)

There are three concentric thin spheres of radii a,b, c (a>b>c). The outer surface charge densities of their surfaces are σ, -σ and σ respectively. Find the magnitude of electric field at r (distance from centre) such that a>r>b ?? My answer was, Er = [ K σ . 4 (pi) c2 / r2 - K σ ...