When a dielectric medium is completely homogeneous, the internal potential gradient is_____________?
Show answer Hide answer
Answer: A. uniform
Explanation
A completely homogeneous dielectric medium possesses uniform physical and electrical properties throughout its entire internal volume. Uniform material composition ensures that the electric field and internal potential gradient do not vary from point to point. Symmetry and consistency in the dielectric structure directly result in a uniform spatial potential drop across the medium. Homogeneity means that material parameters such as permittivity remain constant at every single coordinate within the substance. Potential gradient describes the rate of change of electric potential with respect to spatial distance in an electric field. Discontinuities in material composition typically cause localized distortions in both electric fields and internal potential gradients.
A non-uniform potential gradient only occurs when the dielectric medium contains impurities, physical defects, or variable composition. A zero potential gradient would imply the complete absence of any voltage difference or electric field across the medium. Listing any of the above ignores the strict physical relationship between material homogeneity and electric field uniformity.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. The time constant of an R-C circuit can also be specified as the duration during which the charging current drops to ________ percent of its initial peak value
Show answer Hide answer
Answer: A. 37
The time constant of an RC circuit determines the rate at which charging or discharging processes occur exponentially. Mathematical derivation shows that after one complete time constant, the charging current decays to a...
Q2. The dielectric constant (relative permittivity) characteristic of optical glass is given by___________?
Show answer Hide answer
Answer: D. 5 to 100
Optical glass has a relative permittivity typically ranging between 5 and 100 depending on chemical composition. The correct option captures the broad permittivity range exhibited by various types of optical glass formul...
Q3. Connecting a 1-farad capacitor across a 4-volt e.m.f. source will result in a stored energy of_____________?
Show answer Hide answer
Answer: D. 8 joules
Stored energy in any capacitor is calculated using the standard formula equal to one half times capacitance times voltage squared. Substituting the given values into the equation yields one half multiplied by one farad m...
Q4. Which common medium exhibits the lowest dielectric breakdown strength ____________?
Show answer Hide answer
Answer: D. Air
Air is a gaseous medium with significantly lower molecular density and dielectric breakdown strength than solid insulating materials. Solid materials feature tightly bound crystal lattices that resist electrical breakdow...
Q5. Inserting a solid dielectric slab into an existing air-filled parallel-plate capacitor causes the interplate potential difference to______________?
Show answer Hide answer
Answer: B. decrease
Inserting a solid dielectric slab into a disconnected charged capacitor increases capacitance, decreasing potential difference. Because charge remains constant on an isolated capacitor, boosting capacitance forces the vo...
Q6. Which category of capacitor is predominantly deployed in single-phase AC induction motors ?
Show answer Hide answer
Answer: C. Electrolytic capacitor
Single phase AC induction motors require high capacitance values to create phase shifted starting magnetic fields effectively. Electrolytic capacitors provide the large capacitance ratings necessary within compact physic...