Question

A voltmeter has a least count of $0.05V$ while doing ohm's law experiments, a student observed that the pointer of the voltmeter coincides with 20th division. The observed reading is

• A. $0.75V$
• B. $1V$
• C. $10V$
• D. $0.0V$

Answer 1

Answer: (B)

$1V$

Least count of voltmeter $L.C=0.05V$

Coinciding division $n=20$

Observed voltmeter reading $V=L.C\times n=0.05\times 20=1$ volt

hence the observed reading is $1V$.