A condenser is charged using a constant current. The ratio of the magnetic fields at a distance ...

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A condenser is charged using a constant current. The ratio of the magnetic fields at a distance of \( R / 2 \) and \( R \) from the axis of condenser ( \( R \) is the radius of plate) while charging is
(a) \( 1: 1 \)
(b) \( 2: 1 \)
(c) \( 1: 2 \)
(d) \( 1: 4 \)
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