Question

Assertion (A): On Increasing the current sensitivity of a galvanometer by increasing the number of turns may not necessarily increase its voltage sensitivity.

Reason (R): The resistance of the coil of the galvanometer increases on increasing the number of turns.

Select the most appropriate answer from the options given below:

विकल्प

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false and R is also false.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

When the number of turns in a coil is increased, the resistance of the coil increases as well. As a result, higher current sensitivity does not always equal increased voltage sensitivity.

`"V"_"g" = "l"_"g"/"R"`

∴ if I_g ↑ & R ↑ by different amounts, then V_g may increase or decrease.