Current Electricity Charging Discharging Of Capacitors Question 269
Question: A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
[AMU (Med.) 2000]
Options:
A) 1
B) 2
C) 5
D) 10
Show Answer
Answer:
Correct Answer: D
Solution:
$ V=xl\Rightarrow iR=xl $
$ \Rightarrow ,i\times 10=( \frac{2\times {{10}^{-3}}}{{{10}^{-2}}} )\times 50\times {{10}^{-2}}=0.1 $
$ \Rightarrow i=10\times {{10}^{-3}}A=10,mA $ .
BETA
