4 A parallel-plate capacitor C has an initial charge O and plates\" separation d

Question

4 A parallel-plate capacitor C has an initial charge O and plates" separation d A dielectric material (K-2) is inserted between the plates at the mean while the separation parallel between the plates is doubled to become 2d). So, in this process one statement below is wrong (a) V is same (b) U is same (c) O is same (d) E is same la) Before ) Afher 5. Three light-bulbs are ready to get connected to a battery as shown in the circuit below. Which configuration(s) should yield the bulb A to have the maximal luminosity: (a) SI closed, S2 closed (b) SI open, S2 open (c) SI open, S2 closed (d) SI closed, S2 open Thirteen resistors are connected across points A and B as shown in the figure below. What is the equivalent resistance between points A and B? 6. (a) 8? (b) 36 2 (c) 24 ? (d) 162 2? 2? 2? 2? 6? 6 02 4? 2? 20 20 262 2? 7. A beam, composed of both neutrons and electrons, enters a region of magnetic field directed into the page. Assume that the speeds of both types of particles are equal to v. Then the expected deviations are (a) Path 3 for electrons, Path 2 for neutrons (b) Path 1 for electrons, Path 2 for neutrons (c) Path 1 for electrons, Path 3 for neutrons (d) Path 3 for electrons, Path I for neutrons 4 Path 3

Explanation / Answer

4) option d)

As with d' = 2d and k = 2 =====> C = ke0A/d' = eoA/d ====> Remain same

Then Q = CV =====> Remains same

So, E = Vd ====> will become double

5) Option C)

6) Option A)

Starting from right side of the circuit.

2,2,4,2,2 ohm resistors are in series =====> Resistance = 12 ohm

Then this 12 ohm and 6 ohm are in parallel ======> Resistance = 12*6/(12 + 6) = 4 ohm

Then this 4 ohm and 2,2,2,2, ohms are in series =====> Resistance = 12 ohm

Then this 12 ohm and 6 ohm are in parallel ======> Resistance = 12*6/(12 + 6) = 4 ohm

Then this 4 ohm and 2,2 ohms are in series =====> Resistance = 8 ohm

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