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  • Help me please, A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2 Wb m-2 in 0.01 s. The e.m.f. induced in the coil is :

   A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2  Wb m-2 in 0.01 s. The e.m.f. induced in the coil is :

  • Option 1)

    400 mV

  • Option 2)

    200 mV

  • Option 3)

    4 mV

  • Option 4)

    0.4 mV

 

Answers (1)

best_answer

As we discussed in concept

IF Magnetic field (B) — change -

\varepsilon = -NA\cos \Theta \left ( \frac{dB}{dt} \right )

-

 

 \frac{dB}{dt}= \frac{10^{-2}}{0.01} = 1 T /s

 

\varepsilon = NA \frac{dB}{dt}= 1000\times 4 \times 10^{-4}\times 1\\ = 4V \\ = 400 mV

 

 

 

 

 


Option 1)

400 mV

Option 2)

200 mV

Option 3)

4 mV

Option 4)

0.4 mV

Posted by

Avinash

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