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ELECTROMAGNETIC INDUCTION — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsELECTROMAGNETIC INDUCTION2 Marks
Question
By which different ways can magnetic flux linked with a conducting coil be changed ?
✓

Answer

→Magnetic flux linked with coil,
$\begin{aligned}
\phi_{ B } & = N (\overrightarrow{ B } \cdot \overrightarrow{ A }) \\
& = NBA \cos \theta \\
& = NBA \cos \omega t
\end{aligned}$
→From above equation, it is clear that by making change in any one or more terms out of $N , B$, $\dot{A}$ and $\theta$, magnetic flux can be changed.
→Thus, magnetic flux can be changed -
→ By rotating coil in magnetic field, changing angular speed $(\omega / \theta)$
→ By changing dimensions of conductor (A)
→ By placing coil in magnetic field changing with time. (B)
→By changing number of turns of the coil $( N )$

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