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# ch25_p75 - 75(a Since the field is constant and the...

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75. (a) Since the field is constant and the capacitors are in parallel (each with 600 V across them) with identical distances ( d = 0.00300 m) between the plates, then the field in A is equal to the field in B : G E V d = = × 2 00 10 5 . . V m (b) 5 | | 2.00 10 V m . E = × G See the note in part (a). (c) For the air-filled capacitor, Eq. 25-4 leads to σ ε = = = × q A E 0 6 2 177 10 G . . C m (d) For the dielectric-filled capacitor, we use Eq. 25-29: σ κε = = × 0 6 2 4 60 10 G E . . C m (e) Although the discussion in the textbook (§25-8) is in terms of the charge being held fixed (while a dielectric is inserted), it is readily adapted to this situation (where comparison is made of two capacitors which have the same
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