A long soleniod has 200 turns per cm and carries a current i. The magnetic field at its centre is 6.28×10−2Weber/m2. Another long solenoid has 100 turns per cm and it carries a current i3 The value of the magnetic field at its centre is
A
1.05×10−4Weber/m2
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B
1.05×10−2Weber/m2
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C
1.05×10−5Weber/m2
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D
1.05×10−3Weber/m2
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Solution
The correct option is B1.05×10−2Weber/m2 B2=B1n2i2n1i1=(6.28×10−2)(100×i3)200(i)=1.05×10−2W/m2