A current carrying rectangular loop PQRS is made of uniform wire. The length PR = QS =5 cm and P....

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A current carrying rectangular loop PQRS is made of uniform wire. The length PR = QS =5 cm and PR = QS =100 cm. 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 fPQI:fPQ2I is:
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