Advertisements
Advertisements
Question
The Figure below shows a potentiometer circuit in which the driver cell D has an emf of 6 V and internal resistance of 2 Ω. The potentiometer wire AB is 10 m long and has a resistance of 28 Ω. The series resistance RS is of 2 Ω.
- The current Ip flowing in the potentiometer wire AB when the jockey (J) does not touch the wire AB.
- emf of the cell X if the balancing length AC is 4.5 m.
Advertisements
Solution
- Resistance of 10 m wire AB = 28 Ω
Rs = 20 Ω
r = 2 Ω
∴ Total resistance (R) = (28 + 20 + 2) Ω = 50 Ω
`I_p = V/R`
= `6/50 A`
= 0.12 A - VAB = IP × RAB
= 0.12 × 28 V
= 3.36 V
emf of cell `X = Kl ...(("Here" K = 3.36/10 Vm^-1 = 0.336 Vm^-1),(and l = 4.5 m))`
X = 0.336 × 4.5 V
X = 1.512 V
APPEARS IN
RELATED QUESTIONS
When the balance point is obtained in the potentiometer, a current is drawn from ______.
A battery of emf 4 volt and internal resistance 1 Ω is connected in parallel with another battery of emf 1 V and internal resistance 1 Ω (with their like poles connected together). The combination is used to send current through an external resistance of 2 Ω. Calculate the current through the external resistance.
Find the equivalent resistance between the terminals of F and B in the network shown in the figure below given that the resistance of each resistor is 10 ohm.
A potentiometer is used to measure the potential difference between A and B, the null point is obtained at 0.9 m. Now the potential difference between A and C is measured, the null point is obtained at 0.3 m. The ratio `E_2/E_1` is (E1 > E2) ______
The current drawn from the battery in the given network is ______
(Internal resistance of the battery is neglected)
In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by ______.
It is observed in a potentiometer experiment that no current passes through the galvanometer when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is ______.
Specific resistance of a conductor increase with.
1°C rise in temperature is observed in a conductor by passing a certain current. If the current is double then the rise in temperature is approximately.
In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?
