(A) : A galvanometer can be used as an ammeter and Voltmeter.
(R) : A galvanometer cannot be used in electric circuit to detect the direction of electric current.

Options

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

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided.

**Step 1: Analyze the Assertion (A)**
The assertion states: "A galvanometer can be used as an ammeter and voltmeter."
- A galvanometer is a device that measures small electric currents. It can indeed be modified to function as an ammeter by connecting a low resistance (shunt resistor) in parallel with it. This allows it to measure larger currents without damaging the galvanometer.
- Additionally, a galvanometer can be converted into a voltmeter by connecting a high resistance in series with it. This allows it to measure the voltage across a component in a circuit.

**Conclusion for Assertion (A):**
The assertion is **true**.

**Step 2: Analyze the Reason (R)**
The reason states: "A galvanometer cannot be used in an electric circuit to detect the direction of electric current."
- This statement is incorrect. A galvanometer is specifically designed to detect the direction and magnitude of electric current. It has a needle that deflects in response to current flow, indicating both the strength and direction of the current.

**Conclusion for Reason (R):**
The reason is **false**.

**Final Conclusion:**
- The assertion (A) is true, while the reason (R) is false. Therefore, the correct option is that the assertion is true and the reason is false.