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In a capacitor, dielectric is used—
  • a)
    To increase its capacitance value
  • b)
    To increase its size
  • c)
    To provide a physical strength to it
  • d)
    To decrease the capacitance value
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In a capacitor, dielectric is used—a)To increase its capacitance...
When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field which reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also reorient so that their symmetry axis aligns to the field.
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In a capacitor, dielectric is used—a)To increase its capacitance valueb)To increase its sizec)To provide a physical strength to itd)To decrease the capacitance valueCorrect answer is option 'A'. Can you explain this answer?
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