JEE Main Solved Paper 2017 Question 15

Question: When a current of 5 mA is passed through a galvanometer having a coil of resistance $ 15,\Omega , $ it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into to voltmeter of range 0 - 10 V is: JEE Main Solved Paper-2017

Options:

A) $ 2.535\times 10^{3}\Omega $

B) $ 4.005\times 10^{3}\Omega $

C) $ 1.985\times 10^{3}\Omega $

D) $ 2.045\times 10^{3}\Omega $

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ 10=(5\times {10^{-3}})(15+R) $ $ r=1985,\Omega $