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Questions and Answers
The unit of intensity of electric field is:
The unit of intensity of electric field is:
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?
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:
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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Description
Test your knowledge of electric charges and fields with these previous year questions from the HP Board Physics XII exam. Questions cover topics like intensity of electric field, permittivity of free space, and electric dipole.
