Three large identical conducting parallel plates carrying charge +Q, −Q and +2Q, respectively, are placed as shown in figure. If EA, EB and ECrefer to the magnitudes of the electric fields at points A, B, and C, respectively, then
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a
EA> EB>EC
b
EA= EB>EC
c
EA=0 and EB>EC
d
EA=0 and EB=EC
answer is D.
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Detailed Solution
EP=0 (since it is a point inside conductor)or K[Q−q2ε0−q2ε0+q2ε0+Q−q2ε0−(Q+q)2ε0−(Q−q)2ε0]=0or q= 0Clearly =EA=0EB=−2KQ2ε0=−KQε0EC=2KQ2ε0=KQε0In magnitude, EB=EC
Three large identical conducting parallel plates carrying charge +Q, −Q and +2Q, respectively, are placed as shown in figure. If EA, EB and ECrefer to the magnitudes of the electric fields at points A, B, and C, respectively, then