- #1
bharath423
- 30
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hello i had a question bothering me very much,
A dielectric slab is inserted between the plates of an isolated capacitor.The force between the plates will
a)increase b)decrease
c)remains unchanged d)becomes zero
...
ans given:(c)
I have 2 cases
1)charged with battery, removed battery ,then dielectric placed
so if we place a dielectric the field between the plates fall by a factor K(dielectric constant),so the force should change
2)charged with battery,battery remains,then dielectric placed
so if i consider this case,since the potential difference and distance remain constant from relation V=Ed , field E would remain the same,so as to keep it constant charge on the capacitor is increased by getting additional charge from the battery.
so the force on the plates should increase because though the E does not change as free charge on plates increases...
so force changes in both cases according to me...where i was wrong!
if the force remain unchanged then how does the energy stored increases than the case where no dielectric is there!
please kindly reply,thank you.
A dielectric slab is inserted between the plates of an isolated capacitor.The force between the plates will
a)increase b)decrease
c)remains unchanged d)becomes zero
...
ans given:(c)
I have 2 cases
1)charged with battery, removed battery ,then dielectric placed
so if we place a dielectric the field between the plates fall by a factor K(dielectric constant),so the force should change
2)charged with battery,battery remains,then dielectric placed
so if i consider this case,since the potential difference and distance remain constant from relation V=Ed , field E would remain the same,so as to keep it constant charge on the capacitor is increased by getting additional charge from the battery.
so the force on the plates should increase because though the E does not change as free charge on plates increases...
so force changes in both cases according to me...where i was wrong!
if the force remain unchanged then how does the energy stored increases than the case where no dielectric is there!
please kindly reply,thank you.
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