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  4. P , Q and R are long straight wires in air, carrying currents as shown. The force on Q is directed <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-bb0cl8ekvaug.png />

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Q. $P$ , $Q$ and $R$ are long straight wires in air, carrying currents as shown. The force on $Q$ is directed



Question

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

Since the magnetic field at $Q$ by $P$ and $R$ is inward, therefore, both due to $20 \, A$ $\left(P\right)$ as well as $60 \, A$ $\left(R\right)$ , the force on $Q$ is towards left.