A spherical metal shell A of radius RA and a solid metal sphere B of radius RB (A) are kept far apart and each is given charge ‘+Q’, Now they are connected by a thin metal wire Then (a) EAinside = 0(b) QA > QB(c) s A/ sB = RB/RA(d) EAonsurface Bonsurface

(a,b,c,d)

Electric field inside a spherical metallic shell with charge on the surface is always zero. Therefore option [a] is

correct.

When the sells are connected with a thin metal wire then electric potentials will be equal, say V

? 1/ 4p ?₀ Q_A/R_A = 1 / 4 p ?₀ Q_B­/R_B = V

As R_A > R_B therefore Q_A > A­_B option [b] is also correct.

As sA/sB QA/4pR²A/QB/4pR²_B = R²_B / R²_A x 4p ?₀ R_AV / 4p ?₀ R_AV

? s_A/s_B = R_B / R_A

Option (c) is also correct

Also E_A = s_A/ s_B = R_B/R_A < 1 ? E_A < E_B

Option (d) is also correct