Saved Bookmarks
| 1. |
Circuit shown here uses an air filled parallel plate capacitor. A mica sheet is now introduced between the plates of capacitor. Explain with reason the effect on brightness of the bulb B. |
|
Answer» Solution :Brightness of bulb depends on current. `P prop I^2` and `I= (V)/(Z)` where `Z = sqrt(X_( c)^(2) + R^2) and X_(C) = (1)/(omega C) = (1)/(2pi v C)` `X_(C ) prop (1)/(C )`, when MICA SHEET is introduced capacitance C increases `(C = (K in_(0) A)/(d))`, `X_(C)` decreases, current increases and THEREFORE brightness increases. |
|