| Magnetic flux through a coil of resistance \[10\Omega \]is changed by \[\Delta \phi \]in 0.1 s. The resulting current in the coil varies with time as shown in the figure. [JEE ONLINE 12-05-2012] |
| Then\[|\Delta \phi |\]is equal to (in weber) |
 |
A) 6
B) 4
C) 2
D) 8
Correct Answer: C
Solution :
| [c] As \[e=\frac{\Delta \phi }{\Delta t}\] or \[Ri=\frac{\Delta \phi }{\Delta t}\left( \because e=Ri \right)\] |
| \[\Rightarrow \]\[\Delta \phi =R(i.\Delta t)\] |
| \[=R\times \]area under i-t graph |
| \[=10\times \frac{1}{2}\times 4\times 0.1=2\]weber |
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