Welcome Visitor! Login | Sign Up | Help!

|

Follow us on:

Electricity

Blazing goIITian

 Joined: 5 Nov 2007 Post: 507
10 Oct 2008 14:00:20 IST
0 People liked this
6
935
Potentiometer conceptual doubt
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

The given figure represents a potentiometer with balance point at X.

What will happen to balance point if :

a) R is increased?

b) S is increased?

c) P is replaced by a cell with lower emf than Q?

Please give the entire explanation, especially for a) and b).

Thanks!:-)

Rates assured!

#### Comments (6)

Blazing goIITian

Joined: 6 Apr 2007
Posts: 851
10 Oct 2008 18:26:08 IST
2 people liked this

### Next suppose u increased the resistance which will result decrease in value of current in potential metre so for producing same potential drop=EMF of cell Q u hav to shift the balance point toward"s B..

Blazing goIITian

Joined: 6 Apr 2007
Posts: 851
10 Oct 2008 18:32:12 IST
1 people liked this

### B-As no current flows through galvanometre, cell Q , or resistance S when potential metre is at balanced position.Hence there will be no effect of decreasing\increasing value of S..

Blazing goIITian

Joined: 6 Apr 2007
Posts: 851
10 Oct 2008 18:48:04 IST
0 people liked this

### if P is replaced by a cell with lower emf than Q then u can not achieve balance point.now u can think y not............

Blazing goIITian

Joined: 5 Nov 2007
Posts: 507
11 Oct 2008 00:00:41 IST
0 people liked this

Is it because the arm has very low pd across it, but the jockey is connected to high pd and so they can't balance each other?

Thanks a lot for the answers- the first one is now clear. But the answer to b) says that it will shift to the left.

Is the book answer wrong?

New kid on the Block

Joined: 1 Sep 2008
Posts: 6
11 Oct 2008 13:54:51 IST
0 people liked this

if we increase the resistance S then the potential difference across point A and point X will decrease and so we have to shift the jockey towards left to make the potential difference of the potentiometer cell and the cell which we have attached thereby getting a null deflection point

Blazing goIITian

Joined: 6 Apr 2007
Posts: 851
11 Oct 2008 14:16:59 IST
0 people liked this

ya surely answer of b is wrong in book if it is what u r saying.

# Quick Reply

### Reply

 Some HTML allowed. Keep your comments above the belt or risk having them deleted. Signup for a avatar to have your pictures show up by your comment If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team
Free Sign Up!

## For Quick Info

Name

Mobile

E-mail

City

Class

### Find Posts by Topics

Physics

Topics

Mathematics

Chemistry

Biology

Institutes

Parents Corner

Board

Fun Zone

Sponsored Ads
Vertical Limit

Top Contributors
All Time This Month Last Week
1. Bipin Dubey
 Altitude - 16545 m Post - 7958
2. Himanshu
 Altitude - 10925 m Post - 3836
3. Hari Shankar
 Altitude - 9960 m Post - 2185
4. edison
 Altitude - 10815 m Post - 7797
5. Sagar Saxena
 Altitude - 8625 m Post - 8064
6. Yagyadutt Mishr..
 Altitude - 6330 m Post - 1979