Four resistances 10 Omega, 10 Omega, 10 ...

Four resistances `10 Omega`, `10 Omega`, `10 Omega` and `15 Omega` form a Wheatstone's network. What shunt is required across `15 Omega` resistor to balance the bridge

`10 Omega`

`15 Omega`

`20 Omega`

`30 Omega`

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