A current carrying rectangular loop PQRS...

A current carrying rectangular loop PQRS is made of uniform wire.The length `PR=QS=5cm` and `PQ=RS=100cm`.if ammeter current reading changes from `I` to `2I`,the ratio of magnetic forces per unit length on the wire `PQ` due to wire `RS` in the two cases respectively `(f_(PQ)^I:f_(PQ)^(2I))`

`1 : 5`

`1 : 3`

`1 : 2`

`1 : 4`

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