+91-87964 74404
FlagBACK
Question icon
Grade 12Electric Current

Find x if P is a Null point.Resisstance of potentiometer is 20 ohm

Question image for Find x if P is a Null point.Resisstance of potenti
Profile image of Pata venkateswarlu
8 Years agoGrade 12
Answers icon

1 Answer

Profile image of Saurav
8 Years ago
HI PATA VENKATESWARLU!
I WISH I COULD INSERT AN IMAGE,
THE QUESTION IS PREETY SIMPLE
DEVIDE THE CIRCUIT IN THREE EASY CIRCUITS TTHAT YOU SEE IN YOU ATTACHMENT CLEARLY : TOP,MIDDLE,BOTTOM
AS WE KNOW P IS NULL POINT 0 A CURRENT WILL FLOW THROUGH THE GALVANOMETER
ALSO THE LEFTMOST WIRE OF MIDDLE LOOP WON’T CARRY ANY CURRENT – AS ITS  OBVIOUS
NOW FIND CURRENT IN TOP AND BOTTOM CIRCUITS SEPARATELY V=IR
IN TOP LOOP IT WILL BE 3 A
AND IN BOTTOM LOOP IT WIIL BE 5A
NOW SEE THE MIDDLE CIRCUIT AGAIN AND APPLY KVL IN IT YOU WILL GET THE FOLLOWING EQ.
3*(20/10)(10-X)+5 *2 = 20
THEREFORE X WILL BE 25/3
PLEASE APPROVE
 

Other Related Questions on electric current

question mark
The fig. Shows a network of resistance in which the point A is earthed
 
electric current
0 Answer Available

Last Activity: 4 Years ago

question mark
When a p.d of 2v is applied across a resistor, 10j of energy are covered. What charge flows through the resistor?
 
electric current
0 Answer Available

Last Activity: 4 Years ago

question mark
Please provide it's solution. In video form 
Find the equivalent resistance of the given figure
electric current
1 Answer Available

Last Activity: 4 Years ago

question mark
The resistivity of material is 10 ohm m at 30 C when the temperature drops to 28 then the resistivity  drops by 2. The temperature coefficient of resistivity of material is 
electric current
1 Answer Available

Last Activity: 4 Years ago

question mark
Three cells of 2.0v each and internal resistance of 1.0 each are connected in series and in parallel calculate the new emf and new internal resistance in each connection
 
electric current
1 Answer Available

Last Activity: 4 Years ago