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Questions and Answers
The unit of intensity of electric field is:
The unit of intensity of electric field is:
- Nm$^{2}$C$^{-2}$
- NC$^{-1}$
- J$C^{-1}$
- V/m (correct)
What is the value of permittivity ($\varepsilon_{0}$) of free space in S.I. system?
What is the value of permittivity ($\varepsilon_{0}$) of free space in S.I. system?
- 8$\times$10$^{-11}$ N$^{-1}$m$^{-2}$C$^{2}$
- 8.8$\times$10$^{-9}$ N$^{-1}$m$^{-2}$C$^{2}$
- 8.8$\times$10$^{-10}$ N$^{-1}$m$^{-2}$C$^{2}$
- 8.85$\times$10$^{-12}$ N$^{-1}$m$^{-2}$C$^{2}$ (correct)
Electric field intensity due to an electric dipole at a point at distance 'r' from its centre varies as:
Electric field intensity due to an electric dipole at a point at distance 'r' from its centre varies as:
- $r^{3}$
- $r^{-3}$ (correct)
- $r$
- $r^{2}$
Number of electrons forming 1 Coulomb Charge is equal to:
Number of electrons forming 1 Coulomb Charge is equal to:
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When a body becomes positively charged, its mass:
When a body becomes positively charged, its mass:
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Study Notes
Electric Field Intensity
- The unit of electric field intensity is volts per meter (V/m).
- This measures the force experienced by a unit positive charge placed in the field.
Permittivity of Free Space
- Permittivity ((\varepsilon_{0})) of free space in the S.I. system is approximately (8.85 \times 10^{-12} , \text{F/m}) (farads per meter).
- It is a constant that characterizes how electric fields interact with a vacuum.
Electric Field Intensity from an Electric Dipole
- The electric field intensity due to an electric dipole decreases with distance from the dipole.
- It varies as ( \frac{1}{r^3} ) in the far field region, where 'r' is the distance from the dipole's center.
Charge of Electrons
- The number of electrons that constitute a charge of 1 Coulomb is approximately (6.24 \times 10^{18}).
- This is derived from the elementary charge of an electron, which is roughly (1.6 \times 10^{-19} , \text{C}).
Mass Change with Positive Charge
- When a body becomes positively charged, it loses electrons; thus, its mass slightly decreases.
- The mass change is extremely small, consistent with the mass of lost electrons compared to macroscopic measurements.
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