Lab Quiz 7 Capacitance Lats Qula Probiem 7.1 Twe paral conducting plates that ar

Question

Lab Quiz 7 Capacitance Lats Qula Probiem 7.1 Twe paral conducting plates that are very large compared to their separation are held g thepotential plates area distance d apart, the electric field between the plates is E teplates when they are d parlates are move to a distance 2d apart. What is the electric umential Select One of the Following (a) (b) 2K (c) 4E (d))/2 (e) E/4 lob Quls Problem 7.2 The work done to move a charged particle around a closed path in an arbitrary electric field is always ero How can this be? Select One of the Following a) The force must be zero at all points on the path. The force is always perpendicular to the path along which the charge is moved. (e) The positive work done along some parts of the path is balanced by negative work along other parts of the path (d) The work must be zero at all points along the path. (e) The path must be chosen carefully to produce zero work around the path is connected to a battery with potential difference . If the capacitor is If the potential difference across the capacitor was s allowed to charge for a long time, what would be the new potential energy Lab Quiz Problem 7.3 A capacitor allowed to charge for a long time. its potential again the capacitor wa energy is U. If the poten doubled and again the capacitor was allnery of the capacitor in terms of the original energy U Select One of the Following (e) (a) u (e) U/A Lab Quiz Problem 7.4 A capacitor with capacitance C is filled with a dielectric with dielectric constant if the original the dielectric constant of the dielectric was doubled, what would the new capacitance be in terms of uld the new capacitance be in terms capacitance C Select One of the Following: (a) C (b)2C ()C(d c/2 () C/4

Explanation / Answer

7.1 as electric field is given by E = V/l

On doubling the length l, electric field will reduce to half.

Correct option is "d"

7.2 "c" is the correct option. Work done is given by F.dS , in some places, force will be in opposite direction and in some places it will be in the direction of motion and hence net effect will be zero.

7.3 energy stored in the capacitor is given by E = 1/2CV2

Hence, if we double the V then energy will become 4 times, correct answer is "c"

7.4 capacitance of a capacitor witj dielectric filled is given by

C = k(epsilono) A/d

Hence, if k os doubled, C will also double.

Correct answer is "b"

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