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MODEL PAPER 10 — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMODEL PAPER 103 Marks
Question
A rectangular coil P is moved from a point A to another point B with uniform velocity 'v' through a region of a uniform magnetic field acting normally inwards as shown in the figure. Show graphically (i) the variation of magnetic flux associated with the coil with time, (ii) the variation of induced emf across points X and Y of the coil with time. 
Image

Explain the nature of variation in magnetic flux as represented by the graph in the first case.
✓

Answer

The graphs given in the figure show the variation of flux $\phi$ with time $t$ and induced emf $\varepsilon$ with time t , respectively.
Image

Explanation of variation of magnetic time. Magnetic flux is proportional to the coil linked with flux. Initially, the coil lies magnetic field, flux through it is zero. As the field at time $t_1$ the flux begins to increase. with time. Between times $t_2$ and $t_3$, in the magnetic field, so flux remains: After this the flux decreases linearly with reduces to zero at time $t_4$, when the coil co the magnetic field.

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