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51.

Three plates `A, B, C` each of area `50 cm^(2)` have separation `3 mm` between `A` and `B mm` between `B` and `C`. The energy stored when the plates area fully charged is A. `1.6xx10^(-9)j`B. `2.1xx10^(-9)j`C. `5xx10^(-9)j`D. `7xx10^(-9)j`

Answer» Correct Answer - B
Discussion
52.

In the circuit shown in Fig, initially `K_(1)` is closed and `K_(2)` is open . What are the charges on each capacitor. Then `K_(1)` was opened and `K_(2)` was closed (order is important). What will be the charge on each capacitor now ? `[C = 1muF]`

Answer» Correct Answer - `"case I:" Q_(1) =18 mu C, Q_(2) = 9mu C"and"Q_(3)=0`
`"case I:" Q_(2) =9/2 mu C, Q_(3) = 9/2mu C
Discussion
53.

A parallel plate capacitor is to be designed which is to be connected across 1kv potential.The dielectric meteral which is to be Filled between the plates has dielectric constant `K=6pi` and dielectric strenght `10^(7)V//m.`For safly the eletric field is never to exceed 10 % of the dielectirc strenght.With such specification, of we want a capacitor of 50pF, What minumim area (in `mm^(2)`) of plates is required for safe working ? `("use"" " epsilon_(0)=(1)/(36pi)xx10^(-9)"in""MKS")`

Answer» Correct Answer - `300mm^(2)`
Discussion
54.

The true statement is, on increasing the distance between the plates of a parallel plate condenserA. The electric insensity between the plate will decreaseB. The electric intensity between the plate will increaseC. The elelctric intensity between the plate remain unchargedD. The PD between the plate will decrease

Answer» Correct Answer - C
Discussion
55.

Between the plates of a parallel plate condenser, a plate of thickness `t_(1)` and dielectric constant `k_(1)` is placed. In the rest of the space, there is another plate of thickness `t_(2)` and dielectric constant `k_(2)`. The potential difference across the condenser will beA. `(Q)/(Aepsilon_(0))(t_(1)/k_(1)+t_(2)/(k_(2)))`B. `(epsilon_(0)Q)/(A)(t_(1)/k_(1)+t_(2)/(k_(2)))`C. `(Q)/(Aepsilon_(0))"(t_(1)/k_(1)+t_(2)/(k_(2)))`D. `(epsilon_(0)Q)/(A)(k_(1)t_(1)+k_(2)t_(2))`

Answer» Correct Answer - A
Discussion
56.

In the adjoining figure, four capacitors are shown with their respective capacities and the `P.D.` applied. The charge and the `P.D`. Across the `4muF` capacitor will be A. `600muC,`150voltsB. `300muC,`75voltsC. `800muC,`200voltsD. `580muC,`200volts

Answer» Correct Answer - D
Discussion
57.

Four condenser are joined as shown in the adjoining figure. The capacity of each is `8 muF`. The equivalent capacity between the points `A` and `B` will be A. 32`muF`B. 2`muF`C. 8`muF`D. 16`muF`

Answer» Correct Answer - A
Discussion
58.

A condenser having a capacity of `6 muF` is charged to `100 V` and is then joined to an uncharged condenser of `14 muF` and then removed. The ratio of the charges on `6 muF` and `14 muF` and the potential of `6 muF` will beA. `(6)/(14)"and" 50 "vollt"`B. `(14)/(6) "and" 30 "volt"`C. `(6)/(14) "and"30 "volt"`D. `(14)/(6) "and"0 "volt"`

Answer» Correct Answer - C
Discussion