Saved Bookmarks
| 1. |
A rectangular coil of 100 turns and size `0.1mxx0.05m` is placed perpendicular to a magnetic field of 0.1 T. If the field drops to 0.05 T in 0.05 s, the magnitude of the emf induced in the coil isA. 2B. 3C. `05`D. 6 |
|
Answer» Correct Answer - C Here, Area of coil, `A=0.1mxx0.05m=5xx10^(-3)m^(2)` Number of turns, N=100 Initial flux linked with the coil `phi_(1)=BAcostheta=0.1xx5xx10^(-3)costheta=5xx10^(-4)Wb` Find flux linked with the coil `phi_(2)=0.05xx5xx10^(-3)cos0^(@)=25xx10^(-5)Wb=2.5xx10^(-4)Wb` The magnitude of induced emf in the coil is `epsi=(N|Deltaphi|)/(Deltat)=(N|phi_(2)-phi_(1)|)/(t)=(100|2.5xx10^(_4)-5xx10^(-4)|)/(0.05)` `=(100xx2.5xx10^(-4))/(0.05)V=0.05` |
|