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  • Can someone explain A coil of area 500 cm2 having 1000 turns is placed such that the plane of the coil is perpendicular to a magnetic field of magnitude 4 × 10-5 weber/m2. If it is rotated by 180° about an axis passing through one of its di

A coil of area 500 cm2 having 1000 turns is placed such that the plane of the coil is perpendicular to a magnetic field of magnitude 4 × 10-5 weber/m2. If it is rotated by 180° about an axis passing through one of its diameter in 0.1 sec, find the average induced emf.

  • Option 1)

    zero

  • Option 2)

    30 mV

  • Option 3)

      40 mV

  • Option 4)

     20 mV

 

Answers (1)

best_answer

 

Rate of change of magnetic Flux -

\varepsilon = \frac{-d\phi }{dt}
 

- wherein

d\phi\rightarrow \phi _{2}-\phi _{1}

\phi _{2}-\phi _{1}- change in flux

 

 Average induced EMF = |\frac{\Delta \phi }{\Delta t}|

\phi_2 =-\phi_1 (since it is turned by 180^{\circ}

E_{av}=\frac{|\phi _2- \phi _1}{\Delta t}=\frac{2 \phi_1}{\Delta t} =\frac{2\times NBA}{\Delta t}

=\frac{2\times 1000\times 4\times 10^{-5}\times 5\times 10^{-2}}{0.1} =40mV

 


Option 1)

zero

Incorrect

Option 2)

30 mV

Incorrect

Option 3)

  40 mV

Correct

Option 4)

 20 mV

Incorrect

Posted by

Plabita

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