Figure shows a coil of radius `2 cm` concentric with a coil of radius `7cm` Each coil has
Channel: Doubtnut
Date: 2020-08-30

Figure shows a coil of radius `2 cm` concentric with a coil of radius `7cm` Each coil has  1000 turns with a current of `5A` . In larger coil, then the current needed in the smaller coil to give the total magnetic field at the centre equal to `2mT` is