Energy stored in a Capacitor
1) A capacitance remains connected to a battery.If the plates of the capacitor are moved closer to each other what happens to a) Capacitance C b) Pottential V c) Charge Q d) charge density σ e) Electric field E f) stored energy U ( CBSE ) a) C = ε 0 A / d ie Cά 1 /d as d, plate seperation decreases C increases b) Since the battery is connected V remains the same c) Q=CV and V is a constant ie Q ά C so as C increases Q also increases ( it implies that charge flows from battery to capacitor) d) σ=Q/ A σ ά Q as Q increases σ also increases e) E= σ/ ε 0 E ά σ as σ increases E also increases or E=V/d as d decrease E increases f) U=½ C V 2 U ά C as C increases U also increases 2) A ca