Download App

Electrostatics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectrostatics1 Mark
Question

Assertion  :   A charged capacitor is disconnected from a battery. Now if its plate are separated farther, the potential energy will fall.

Reason     : Energy stored in a capacitor is equal to the work done in charging it.

(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 assertion is false but reason is true.
✓

Answer

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

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

Explore more

More "M.C.Q [1M]" from Electrostatics→Electrostatics — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Dimensions of coefficient of self-inductance is :
→
A metal sheet is placed in front of a strong magnetic pole. A force needed to:
  1. Hold the sheet there if the metal is magnetic.
  2. Hold the sheed there if the metal is nonmagnetic.
  3. Move the sheet away from the pole with uniform velocity if the metal is magnetic.
  4. Move the sheet away from the pole with uniform velocity if the metal is nonmagnetic. Negative any effect if oaramagnetism, diamagnetism and gravity.
→
The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA. These quantities are VB and ZB for the other tube. Then:

→

A metal wire of specific resistance 64   and length 198 cm has a resistance of  7 ohm, the radius of the wire will be

(a) 2.4 cm

(b) 0.24 cm

(c) 0.024 cm

(d) 24 cm
→

There are two charges +1 microcoulombs and +5 microcoulombs. The ratio of the forces acting on them will be

(a) 1 : 5

(b) 1 : 1

(c) 5 : 1

(d) 1 : 25
→
Because we cannot ever know the initial conditions of groups of objects with perfect precision, the later behaviour of complex systems of objects may be almost completely unpredictable, even the wonderfully successful equations derived from Newtonian mechanics.
The previous statement describes the essence of which theory?
→

The working of optical instruments like camera, microscope, telescope, etc. having glass lenses is based on a phenomenon of light. Identify the phenomenon.

→

A wire has a resistance of 6 W. It is cut into two parts and both half values are connected in parallel. The new resistance is ....

(a) 12 W

(b) 1.5 W

(c) 3 W

(d) 6 W
→

Consider the following two statements

A. Energy spectrum of a-particles emitted in radioactive decay is discrete

B. Energy spectrum of b-particles emitted in radioactive decay is continuous

(a) Only A is correct

(b) Only B is correct

(c) A is correct but B is wrong

(d) Both A and B are correct
→
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if:
  1. It is translated.
  2. It is rotated about its axis.
  3. It is rotated about a diameter.
  4. It is deformed.
→