Question

Assertion (A): Higher the range, lower is the resistance of an ammeter.

Reason (R): To increase the range of an ammeter additional shunt is added in series to it.

Options

• Both (A) and (R) are true, and (R) is correct explanation of (A).

• Both (A) and (R) are true, and (R) is not correct explanation of (A).

• (A) is true, but (R) is false.

• (A) is false and (R) is also false.

Answer 1

(A) is true, but (R) is false.

Explanation:

`R_"sh" = (I_mR_m)/((I - I_m))`

So as range increases, the value of ammeter resistance decreases. The assertion is true. To extend range, lower resistance, and connect a shunt in parallel. Reason is false.