1isn't the answer C ?????
Three Concentric metallic spherical shells of radius R, 2R, 3R are given charges Q1,Q2, Q3 respectively. It is found that the surface charge densities of the outer surface of theshells are equl . Then the ratio of the charges given to the shells Q1:Q2:Q3 is
A) 1:2:3
B) 1:3:5
C) 1:4:9
D) 1:8:18
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12 Answers
62[url=http://iitjee2009solutions.targetiit.com]Solution Key with Question Paper of 2009 IIT JEE[/url]
11Let the charge density be k
Q/A = K
Q/4∩r2 = k
now let 4∩ be C
Q = CK*r2
Q1 = C*K *R2
Q2 = C*K*4R2
Q3 = C*K*9R2
Q1:Q2:Q3
Therefore the rite option is C 1: 4 : 9
