In a region there exists a magnetic field `B_(0)` along positive x-axis. A metallic wire of length 2a, one side along x-axis and one side parallel of y-axis is rotates about y-axis with a angular velocity. Then at the instant shown A. Potential difference across PQ is 0B. Potential difference across PQ is `1/2 B_(0)omega a^(2)`C. Potential difference across QR is `1/2 B_(0)omega a^(2)`.D. Potential difference across QR is `B_(0)omega a^(2)`.

In a region there exists a magnetic field `B_(0)` along positive x-axi

1.	In a region there exists a magnetic field `B_(0)` along positive x-axis. A metallic wire of length 2a, one side along x-axis and one side parallel of y-axis is rotates about y-axis with a angular velocity. Then at the instant shown A. Potential difference across PQ is 0B. Potential difference across PQ is `1/2 B_(0)omega a^(2)`C. Potential difference across QR is `1/2 B_(0)omega a^(2)`.D. Potential difference across QR is `B_(0)omega a^(2)`.
Answer» Correct Answer - A::D PQ is parallel to magnitude field, hence no emf is induced in it. QR is `_\|_^(r)` perpendicular to magnetic field. Induced emf =`Bv1=B_(0)omega a^(2)`.

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