Two coplanar concentric circular conductors made of wire of same material and thickness are connected to batteries E 1 = 20 V and E 2 = 16 V . Their radii are r 1 = 5 cm and r 2 = 10 cm . The

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Two coplanar concentric circular conductors made of wire of same material and thickness are connected to batteries $E_{1} = 20 V$ and $E_{2} = 16 V$ . Their radii are $r_{1} = 5 cm$ and $r_{2} = 10 cm$ . The resistance of the inner circular conductor is $4Ω$ . Find the magnetic induction at the centre O .

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Correct answer: A

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