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Question

Three concentric conducting spherical shells carry charges as follows; + Q on the inner shell, - 2 Q on the middle shell and - 5 Q on the outer shell. The charge on the inner surface of the outermost shell is

A
Zero
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B
+ Q
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C
-2Q
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D
-3Q
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Solution

The correct option is B + Q

+Q (inner shell)
2Q (for middle shell)
5Q (outer shell)
Given charge of the inner surface of outer most shell.
2QQ=Q

1236212_1023245_ans_981be3ed23894e4386a8b496863a5556.jpg

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