The magnetic field at the centre of a circular coil of radius r carrying current I is B1. The field at the centre of another coil of radius 2r carrying same current I is B2. The ratio B1/B2 is?
Added by Justin G.
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The magnetic field \( B \) at the center of a single loop of radius \( r \) is given by: \[ B = \frac{\mu_0 I}{2r} \] where \( \mu_0 \) is the permeability of free space. Show more…
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