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Q.

Due to 10 A of current flowing in a circular coil of 10 cm radius, the magnetic field produced at its centre is 3.14 × 10−3  Wb/m2.  The number of turns in the coil will be

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a

5000

b

100

c

50

d

25

answer is C.

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Detailed Solution

B= μ04π  .  2πNir⇒  3.14  ×  10−3 =  10−7 × 2  ×3.14 × N ×1010 × 10−2 ⇒ N=50
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Due to 10 A of current flowing in a circular coil of 10 cm radius, the magnetic field produced at its centre is 3.14 × 10−3  Wb/m2.  The number of turns in the coil will be