wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The deflection in a galvanometer decreases from 25 divisions to 5 divisions when a resistor of 20Ω is connected in series. Find resistance of galvanometer.

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

The correct option is B 5 Ω
When resistor 20Ω is not connected,
Using V=IR, we get V=25RG...(1) where RG= resistance of galvanometer.
When resistor 20Ω is connected,
V=5(20+RG)...(2)
Using (1), 25RG=5(20+RG)
5RG=20+RG
4RG=20RG=5Ω

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Series and Parallel Combination of Resistors
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon