Some operations which can be performed on a capacitor are defined below :
A : Connect the capacitor to a battery of emf E
B : Disconnect the battery
C : Reconnect the battery with polarity reversed
D : Insert a dielectric slab into the capacitor.
Now choose the incorrect option(s).
a- In action ABC (A then B then C) the stored electric energy remains unchanged and no thermal energy is developed.
b- The charge appearing on capacitor is greater after ADB than after ABD
c- The electric energy stored in the capacitor isgreater after DAB than after ADB
d- The electric field in the capacitor after AD is same as that after the action DA.
Please explain...
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1 Answers
71After inserting the dielectric, the Capacitance changes, so will the Electric field and Energy stored in it. You should consider the process viz., ABC ; that is what happens step by step and why.
I think the incorrect option should be (a). After polarity is reversed, the charges on plates redistribute and some work is done by battery = Lost to thermal energy.
Anirban Mukherjee Yes.....opt (a) is the ans..But how to justify that other options are correct???Upvote·0· Reply ·2012-06-20 05:33:14- Anirban Mukherjee Yes.....opt (a) is the ans..But how to justify that other options are correct???