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A circular coil of radius 8cm, 400 turns and resistance 2Omega is placed with its plane perpendicular to the horizantal component of the earth's magnetic fiedl. It is rotated about its vertical diameter through 180^(@) in 0.30 s. Horizontal component of earth magnitude of current induced in the coil is approximately |
| Answer» <html><body><p>`4xx10^(-<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)A`<br/>`8xx10^(-<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a>)A`<br/>`8xx10^(-2)A`<br/>`1.92xx10^(-3)A`</p>Solution :Initial flux through the coil <br/> `phi_(i)=BAcos theta` <br/> `=3xx10^(-5)xxpixx(8xx10^(-2))xxcos 0^(@)` <br/> `=192pixx10^(-9)Wb` <br/> <a href="https://interviewquestions.tuteehub.com/tag/final-461168" style="font-weight:bold;" target="_blank" title="Click to know more about FINAL">FINAL</a> flux after the rotation <br/> `phi_(<a href="https://interviewquestions.tuteehub.com/tag/f-455800" style="font-weight:bold;" target="_blank" title="Click to know more about F">F</a>)=3xx10^(-5)xxpi(8xx10^(-2))^(2)cos 180^(@)` <br/> `=-192pixx10Wb` <br/> `:.` <a href="https://interviewquestions.tuteehub.com/tag/teh-1240626" style="font-weight:bold;" target="_blank" title="Click to know more about TEH">TEH</a> magnitude of induced emf is <br/> `epsi=N|(dphi|)/(dt)=(N|phi_(f)phi_(i)|)/(dt)` <br/> `=(400xxx(384pxx10^(-9)))/(0.30)=1.6xx10^(-3)V` <br/> Current `I=(epsi)/(R)=(1.6xx10^(-3))/(2)=8xx10^(-4)A`</body></html> | |