OnlineCBT
Physics · Electrostatic Potential
हिन्दीGiven below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The dielectric constant \( K \) of any material medium can take any real value, including values less than 1. Reason (R): Dielectric constant \( K \) is defined as the ratio of the capacitance with dielectric \( C \) to the capacitance without dielectric \( C_0 \). In the light of the above statements, choose the correct answer from the options given below:
Correct answer · Option 4
(A) is false but (R) is true.
Explanation
Assertion (A) is false because for any material dielectric medium, the dielectric constant \( K \ge 1 \) (for vacuum \( K = 1 \)). It can never be less than 1. Reason (R) is true because the dielectric constant of a medium is defined as \( K = C/C_0 \), where \( C \) is the capacitance with the dielectric and \( C_0 \) is the capacitance without the dielectric. Therefore, Assertion (A) is false, but Reason (R) is true.
