Tag: charge

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Multiple choice physics static electricity properties of charges charge properties of charge

A gold coin has a charge of $+10^{-4} C$. The number of electrons removed from it is:

  1. $10^6$
  2. $625 \times 10^{12}$
  3. $1.6 \times 10^{-25}$
  4. $1.6 \times 10^{13}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The total charge of electrons removed from the coin would be equal to the positive charge acquired by the coin.

Thus, $10^{-4}C=n\times 1.6\times 10^{-19}C$
$\implies n=625\times 10^{12}$

Multiple choice physics static electricity properties of charges charge properties of charge

A parallel late condenser consists of two circular plate each of radius $8cm$ separated by a distance of $2mm$. It is charged by an external source, with a constant charging current of $0.15$ A. The displacement.curcent is

  1. $0.10A$
  2. $0.15A$
  3. $0.20A$
  4. $0.30A$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Displacement current inside a capacitor is equal to the conduction current charging the capacitor plates. Since the charging current is given as 0.15 A, the displacement current is also 0.15 A.

Multiple choice physics static electricity properties of charges charge properties of charge

Choose best option about cavity for a charged metallic sphere: 

  1. Net field inside the cavity is zero

  2. Net field inside the metal is non-zero constant

  3. Potential inside the metal is constant

  4. Potential outside metal is constant
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Inside the cavity of charged measure sphere net electric field is non zero constant.

$\therefore $ Option $A$ is correct.

Multiple choice physics static electricity properties of charges charge properties of charge

Two charges 2$\mathrm { uC }$ and 1$\mathrm { \mu }C$ are placed at adistance of 10$\mathrm { cm }$ . The position of the third charge from2$\mu \mathrm { C }$ between them so that it does not experience any force

  1. $7cm$
  2. $2cm$
  3. $5.858cm$
  4. $8cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For a charge to experience no force, the electric fields from the two charges must be equal and opposite. Setting k(2)/x^2 = k(1)/(10-x)^2 leads to 2(10-x)^2 = x^2, which simplifies to sqrt(2)(10-x) = x. Solving for x gives x = 10*sqrt(2)/(1+sqrt(2)) approximately 5.858 cm.

Multiple choice physics static electricity properties of charges charge properties of charge

An infinite number of charges each equal to q coulomb are placed along x-axis at x 1, x = 2, x= 8. so on the potential and electric field at x =0 due to this arrangement is

  1. $\dfrac { q } { 2 \pi \varepsilon _ { 0 } } , \dfrac { 3 q } { 4 \pi \varepsilon _ { 0 } }$
  2. $\dfrac { q } { 2 \pi \varepsilon _ { 0 } } \cdot \frac { q } { 3 \pi \varepsilon _ { 0 } }$
  3. $\dfrac { 2 q } { \pi \varepsilon _ { 0 } } , \dfrac { q } { 3 \pi \varepsilon _ { 0 } }$
  4. $\dfrac { q \varepsilon _ { 0 } } { \pi 2 } , \dfrac { q E _ { 0 } } { 3 \pi }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice physics static electricity properties of charges charge properties of charge

The energy of thermal neutrons is

  1. $< 1 \mathrm { ev }$
  2. $> 1 \mathrm { ev }$
  3. $= 2 \mathrm { Mev }$
  4. $= 4 \mathrm { Mev }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermal neutrons are neutrons that are in thermal equilibrium with their surroundings, typically having kinetic energies around 0.025 eV, which is well below 1 eV.

Multiple choice physics static electricity properties of charges charge properties of charge

Quantisation of charge implies :

  1. charge cannot be destroyed

  2. charge exists on particles

  3. there is a minimum permissible charge on a particle

  4. charge, which is a fraction of a charge on an electron is not possible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Quantisation of Charge means that we say something has some charge , we mean by that that how many times the charge of electrons it has.  Because  whole charge is associated with an electron.