Home
Class 12
PHYSICS
A potentiometer wire AB is 100 cm long a...

A potentiometer wire `AB` is `100 cm` long and has total resistance of `10Omega`. If the galvanometer shows zero deflection at the position `C`, then find value of unknown resistance

Text Solution

Verified by Experts

The correct Answer is:
`4 Omega`
Potentiometer will give terminal potential.
`V=E-Ir impliesV=5-5/((R+1))xx1=x xx40`
`5-5/((R+1))=10/100xx40impliesR=4 Omega`
Promotional Banner

Similar Questions

Explore conceptually related problems

The potentiometer wire AB is 600cm long. At what distance (in cm) from A should the jockey J touch the wire to get zero deflection in the galvanometer?

AB is a potentiometer wire of length 100 cm and its resistance is 10 Omega . It is connected in series with a battery of emf 2V and resistance 40 Omega . If a source of unknown emf E is balanced by 40 cm length of the potentiometer wire, the value of E is :-

A potentiometer wire of length 100 cm has a resistance of 100Omega it is connected in series with a resistance and a battery of emf 2 V and of 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?

The potentiometer wire of length 100cm has a resistance of 10Omega . It is connected in series with a resistance of 5Omega and an accumulaot 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 is 10 m long and has a resistance of 2 Omega//"m". It is connected in series with a battery of e.m.f. 3 V and a resistance of 10Omega . The potential gradient along the wire in V/m is