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Two toroids 1 and 2 have total no. of turns 200 and 100 respectively with average radii 40 cm and 20 cm respectively. If they carry same current i, the ratio of the magnetic fields along the two loops is,

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a

1 : 2

b

1 : 1

c

4 : 1

d

2 : 1

answer is B.

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Detailed Solution

Magnetic field inside a toroid inB=μ0N·I2πR Here, B1B2=N1R2N2R1=2001002040=1 So, B1B2=1

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