After a parallel-plate capacitor is charged by a battery, it isdisconnected from

Question

After a parallel-plate capacitor is charged by a battery, it isdisconnected from the battery and its plate separation isincreased. Which of the following statements is correct? 1 Thepotential difference between the plates decreases.
Theenergy stored in the capacitordecreases.    
Theenergy stored in the capacitor increases.
Theelectric field between the plates decreases.
Thecharge on the plates decreases.
1 Thepotential difference between the plates decreases.
Theenergy stored in the capacitordecreases.    
Theenergy stored in the capacitor increases.
Theelectric field between the plates decreases.
Thecharge on the plates decreases.
1 Thepotential difference between the plates decreases.
Theenergy stored in the capacitordecreases.    
Theenergy stored in the capacitor increases.
Theelectric field between the plates decreases.
Thecharge on the plates decreases.
1

Explanation / Answer

      for acapacitor,    C = A / d = q / v            When battery is disconnected, the charge q remains constant               whendistance d increases, then the capacity decreases and potentialdifference increases             Energy stored in capacitor, U = q 2 / 2C             As capacitance is reduced, the energy stored increases            Electric field E = V/d           As V and d both increase by the same factor, E remainsconstant The correct statements is THE ENERGY STORED IN THE CAPACITORINCREASES                  

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