The magnetic field at the centre of a circular coil of radius '$$R$$', carrying current $$2 A$$ is '$$B_1$$'. The magnetic field at the centre of another coil of radius '$$3 R$$' carrying current $$4 A$$ is '$$B_2$$'. The ratio $$B_1:B_2$$ is
- A$$1: 2$$
- B$$2: 1$$
- C$$2: 3$$
- D$$3: 2$$
✓ Correct answer: D
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