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Four resistors of 15ohm, 12ohm, 4ohm and...

Four resistors of `15ohm, 12ohm, 4ohm` and `10ohm` given in cyclic order to form a wheat stone bridge. What resistance (in `ohm`) should be connected in parallel across the `10ohm` resistor to balance the wheat stone bridge

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The correct Answer is:
'10Omega'
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