MCQ
The electric potential of free space is :
  • A
    $9\times10^{9}mF^{-1}$
  • B
    $1.6\times10^{-19}C$
  • $8.85\times10^{-12}Fm^{-1}$
  • D
    $8.85\times10^{-9}Fm^{-1}$

Answer

Correct option: C.
$8.85\times10^{-12}Fm^{-1}$
C

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

The capacity of the parallel plate capacitor increases when:
Two identical thin rings, each of radius a meter, are coaxially placed at a distance R meter apart. If Q1 coulomb and Q2 coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge q coulomb from the centre of one ring to that of the other is:

Assertion  :   For cooking in a microwave oven, food is always kept in metal containers.

Reason      : The energy of microwave is easily transferred to the food in metal container.

(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.

The amplification factor of a triode is 50. If the grid potential is decreased by 0.20 V, what increase in plate potential will keep the plate current unchanged

(a) 5 V

(b) 10 V

(c) 0.2 V

(d) 50 V

The momentum of a photon in an X-ray beam of    metre wavelength is

(a) 1.5  m/sec

(b) 6.6  m/sec

(c) 6.6  m/sec

(d) 2.5 m/sec

In electromagnetic spectrum, the component whose wavelength is minimum is:

A thin circular wire carrying a current I has a magnetic moment M. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment

(a) M       

(b)  

(c)  

(d)  

When charged particle enters-a uniform magnetic field, its K.E:
Choose the correct option about light.

Assertion  :  NAND or NOR gates are called digital building blocks.

Reason      : The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.

(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.