Magnetic Effects Of Current Question 460
Question: A galvanometer of resistance 5 ohms gives a full scale deflection for a potential difference of 10 mV. To convert the galvanometer into a voltmeter giving a full scale deflection for a potential difference of IV, the size of the resistance that must be attached to the voltmeter is
Options:
A) 0.495 ohm
B) 49.5 dim
C) 495 ohm
D) 4950 ohm
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ I_{g}=10\times {{10}^{-3}}/5=2\times {{10}^{-3}}A; $ $ R=\frac{V}{I_{g}}-R_{g}=\frac{1}{2\times {{10}^{-3}}}-5=495\Omega $ .
BETA
