1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# In the circuit shown , the resistance of voltmeter is 10,000 Ω and that of ammeter is 20 Ω. The ammeter reading is 0.10 A and voltmeter reading is 12 V. Then value of R is equal to

A
122 Ω
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
140 Ω
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
116 Ω
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
100 Ω
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

## The correct option is D 100 ΩAs voltmeter is of very large resistance so we can ignore current through it (as it will be very small). All the current of 0.10 A passes through resistance R and ammeter of resistance 20 Ω. As we know, potential difference across any parallel branch is same, (R+20)(0.10)=12 ∴R=100 Ω Hence, option (d) is the correct answer. Why this question ? Key concept : When voltmeter is of very large resistance, we can ignore current through it.

Suggest Corrections
30
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program