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Q.

A circular coil 'A' has a radius R and the current flowing through it is I. Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the Centre of the circular coil are in the ratio of

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a

4:1

b

2:1

c

3:1

d

1:1

answer is D.

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Detailed Solution

B1=μ0i2R

B2=μ02i2x2R=μ0i2R

B1=B2

⇒B1:B2=1:1

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