Question
Assertion  :   A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason     : The surface density of charge on the plate remains constant or unchanged.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 

Answer

(c) If assertion is true but reason is false.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be (a) Positively charged(b) Negatively charged(c) Positively charged or negatively charged depending upon the type of impurity that has been added(d) Electrically neutral
 
 
 
 
Electromagnetic induction is the:
Two capacitors $C _1=2 \mu F$ and $C _2=6 \mu F$ in series, are connected in parallel to a third capacitor $C _3=4 \mu F$. This arrangement is then connected to a battery of $\text{e.m.f.} = 2 V$, as shown in the figure. How much energy is lost by the battery in charging the capacitors
In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is(a) 0.25   (b) 0.26(c) 0.27   (d)  0.28
       
Two magnets $A$ and $B$ are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of $B$ is twice the time period of $A.$ The ratio of the magnetic moments
$\mathrm{M}_{\mathrm{A}} / \mathrm{M}_{\mathrm{B}}$ ot the magnets will be
X-rays are produced due to (a) Break up of molecules          (b) Changing in atomic energy level(c) Changing in nuclear energy level(d) Radioactive disintegration
   
   
The current sensitivity of a galvanometer is defined as:
A person A can clearly see objects between 25cm and 200cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameters of eye identical to that of A?
  1. 25cm to 200cm.
  2. 18cm to 200cm.
  3. 25cm to 300cm.
  4. 18cm to 300cm.
A double convex lens has two surfaces of equal radii R and refractive index $\mu=1.5$ We have,
For the production of characteristic $\mathrm{K}_\gamma \ X-$ray, the electron transition is