InterviewSolution
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InterviewSolution
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A conducting ring of radius `1` meter is placed in an uniform magnetic field `B` of `0.01` tesla coscilliating with frequency `100Hz` with its plane at right angles to `B`. What will be the induced electric field.A. `pivolt//m`B. `2volt//m`C. `10volt//m`D. `20volt//m` |
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Answer» Correct Answer - B In a constant magnetic field conducting ring oscillates with a frequaency of `100Hz`. i.e., `T=1//100s`, in time `T//2` flux links with coil changes from `BA` to zero. :. Induced emf `=("change in flux")/("time")` `=(BA)/(T//2)=(2BA)/(T)` `=2Bxxpir^(2))/(T)` `(2xx0.01xxpixx1^(2))/(1//100)=4piV` induced electric field along the circle, using maxwell equatiion `ointE.dl=-(dphi)/(dt)=A(dB)/(dt)=e` :. `E=(1)/(2pir)xx(pir^(2)xx(dB)/(dt))=(e)/(2pir)=(4pi)/(2pir)=2V//m` |
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