Assertion: Reduction factor (K) of a tangent galvanometer helps in reduction to current.
Reason: Reduction factor increases with increase of current.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If Assertion is false but Reason is true.

Answer

To solve the question regarding the assertion and reason related to the reduction factor (K) of a tangent galvanometer, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states that the reduction factor (K) of a tangent galvanometer helps in reducing the current.

- **Explanation**: The reduction factor (K) is a measure of how much the current in the galvanometer is reduced compared to the actual current flowing through the circuit. A higher reduction factor means that a smaller current is needed to produce the same deflection in the galvanometer.

### Step 2: Analyze the Reason
The reason provided states that the reduction factor increases with an increase in current.

- **Explanation**: This statement is incorrect. The reduction factor (K) does not increase with an increase in current; rather, it is influenced by the physical parameters of the galvanometer such as the number of turns in the coil and the radius of the coil. As the current increases, the deflection in the galvanometer increases, but this does not imply that the reduction factor itself increases.

### Step 3: Conclusion
Now, we can conclude the relationship between the assertion and the reason.

- The assertion is true: The reduction factor (K) does help in reducing the current.
- The reason is false: The reduction factor does not increase with an increase in current.

### Final Answer
Therefore, the answer to the question is that the assertion is true, but the reason is false.