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3. The region between two concentric spherical shell is filled two dielectrics (ɛ,2 =
3ɛr1) as shown in figure.
(a) Plot variations of V, |É| and |D| from r = a to r= b.
(b) Find capacitance of the system
(c) Plot the variation of the capacitance when:
i. a is constant and a < b< 0
ii. bis constant and 0 < a < b
Boundary
-Q
a
b
+Q
Boundary

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