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A solid conducting sphere of
radius 2 cm has a charge of 8
µC. A conducting spherical
shell of inner radius 4 cm
and outer radius 5 cm is
concentric (js sall with
the solid sphere and has a
charge of -4 uC. The electric
field (in N/C) at r = 12 m is:
O 444
1000
O 250
O 111
O 63

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