| In the given circuit the internal resistance of the 18 V cell is negligible. If \[{{R}_{1}}\,\,=\,\,400\,\Omega \], \[{{R}_{3}}=100\text{ }\Omega \] and \[{{R}_{4}}=500\Omega \]and the reading of an ideal voltmeter across \[{{R}_{4}}\] is 5 V, then the value of \[{{R}_{2}}\] will be: [JEE Main 09-Jan-2019 Evening] |
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A) \[550\,\,\Omega \]
B) \[450\,\,\Omega \]
C) \[230\,\,\Omega \]
D) \[300\,\,\Omega \]
Correct Answer: D
Solution :
[d]  |
 |
 |
or  |
 |
So, V across  will be  volt |
 Total current |
I across  Amp. |
Now |
So,  |
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