A coil is placed perpendicular to a magnetic field of 5000 T. When the field is changed to 3000 T in 2 s, an induced emf of 22 V is produced in the coil. If the diameter of the coil is 0.02 m, then the number of turns in the coil is

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(4) 70. (dB)/(dt)=(5000-3000)/2=1000 T s⁻¹. r=0.01 m so A=π r²=3.14×10⁻⁴ m². ε=NA(dB)/(dt)⇒ 22=N×3.14×10⁻⁴×1000=0.314N. N=70.

A coil is placed perpendicular to a magnetic field of 5000 T. When the field is changed to 3000 T in 2 s, an induced emf of 22 V is produced in the coil. If the diameter of the coil is 0.02 m, then the number of turns in the coil is

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