(A) : Self-inductance is called the inertia of electricity.
(R) : Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked with the coil.

Options

A. A) Both .A. and .R. are true and .R. is the correct explanation of .A.
B. B) Both .A. and .R. are true and .R. is not the correct explanation of .A.
C. C) .A. is true and .R. is false
D. D) .A. is false and .R. is true

Answer

To solve the question, we need to evaluate the two statements provided: the assertion (A) and the reason (R).

**Step 1: Analyze the Assertion (A)**
The assertion states that "Self-inductance is called the inertia of electricity."
- Self-inductance refers to the property of a coil (or inductor) that opposes changes in the current flowing through it. This is similar to how inertia in physics refers to an object's resistance to changes in its state of motion. Therefore, this assertion is true.

**Step 2: Analyze the Reason (R)**
The reason states that "Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked with the coil."
- This statement accurately describes the phenomenon of self-inductance. When the current through a coil changes, it induces an electromotive force (e.m.f.) that opposes the change in current, according to Lenz's law. Therefore, this reason is also true.

**Step 3: Determine the Relationship Between A and R**
Now we need to check if the reason (R) correctly explains the assertion (A).
- While both statements are true, the reason does not directly justify the assertion. The assertion describes self-inductance as "inertia of electricity," while the reason explains how self-inductance works. They are related concepts, but the reason does not specifically explain why self-inductance is referred to as inertia.

**Conclusion**
Both the assertion and the reason are true, but the reason does not justify the assertion. Therefore, the correct answer is that both A and R are true, but R is not the correct explanation of A.