Home
Class 12
PHYSICS
A potentiometer wire of length 100 cm ha...

A potentiometer wire of length 100 cm has a resistance of `10Omega.` It is connected in series with a resistance and an accumulator of emf 2V and negligible internal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. what is the value of the external resistance?

A

`790 Omega`

B

`1580 Omega`

C

`690 Omega`

D

`1280 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

The potentiometer wire of length 100cm has a resistance of 10Omega. It is connected in series with a resistance of 5Omega and an accumulat or emf 3V having negligible resistance. A source 1.2V is balanced against a length 'L' of the potentionmeter wire. find the value of L.

A potentiometer wire of length 1 m has a resistance 10 ohm. It is connected to 6 V battery in series with a resistance of 5 ohm. Determine the emf of the primary cell which gives a balance point at 40 cm.

The potentiometer consists of a wire of length 4 m and resistance of 10Omega . It is connected to a cell of e.m.f. 2 V. The potential difference per unti length of the wire will be

A cell of e.m.f. 2 V and negligible internal resistance is connected to a potentiometer wire of resistance 10 Omega and length 4 m. The potential difference per unit length (potential gradient ) of the wire is

The resistance of a potentiometer wire of length 10 m is 25 Omega . A resistance box and a 2 volt accumulator are connected in series with it. What resistance should be introduced in the box to have a potential drop of one microvolt per millimetre of the potentiometer wire ?

The resistance in the left gap of a metre bridge is 10Omega and the balance point is 40 cm form the left end. Calculate the value of the unknown resistance.

There is a potentiometer wire of length 1200 cm and 60 mA current is flowing in it. A battery of emf 5V and internal resistance of 20 ohm is balanced on potentiometer wire with balancing length 1000 cm. find the resistance of the potentiometer wire

A 5m long wire is used with uniform area of cross-section and 50 ohm resistance inpotentiometer.The wire is connected in series with a battery of 10V along with external resistance 450ohm. If unknown emf E is balanced at 4m length of wire, find potential gradient of potentiometer wire and value of unknown emf