The figure shows a circuit when resistance in the two arms of the meter bridge are 5 and R, respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6 l1. The resistance 'R' is: 1. 10 2. 15 3. 20 4. 25

 Question:  From NCERT  | NEET 2014     || [Difficult level:Easy] Subtopic:METER BRIDGE || 

:The figure shows a circuit when resistance in the two arms of the meter bridge are 5 and R, respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6 l1. The resistance 'R' is: 

          

1. 10

2. 15

3. 20 

4. 25

Answer: 2. 15

.

......

👀NCERT Important

Concept used: METER-BRIDGE 

• :It is based on wheatstone bridge.
•  With same principle as of Wheat stone bndge it is used to calculate unknown -resistance. R, underbalance condition,
• 
  

• 
  

:

:Similar Question [NEET 2015]:A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. 

$E_0$and resistance $r_1$. An unknown e.m.f. is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by :

1. $\frac{LE{}_{0}r}{l{r}_1}$

2. $\frac{E_{0}r}{(r+r_1)}\cdot \frac{l}{L}$

3. $\frac{E_{0}l}{L}$

4. $\frac{L{E}_{0}r}{(r+r_1)1}$

::Ans:2. 

$\frac{E_{0}r}{(r+r_1)}\cdot \frac{l}{L}$

How important is Physics NCERT for NEET?

NCERT is more than enough for theory. For MCQs practice NCERT Based Easy and Medium Questions mainly.

Show NEET 2021 Physics paper reference from NCERT

All Click Here

Is everything free in OrganisedNotes.blogspot.com

Yes,always.