What is a null point in a potentiometer?

A null point in a potentiometer is known as a balancing point.

It is the point on the slide wire on which the deflection in the galvanometer is zero.
When the galvanometer detects a current where the deflection is zero, no current flows through the cell.
Therefore, zero deflection means no current is flowing through the galvanometer.

Related Questions

Read More:

Potentiometer – Important Concepts
Power transformers	Difference between air conditioning and refrigeration	Difference between AC and DC
Meter bridge	Relation between power and resistance	Resistance Formula
Electrical Formula	Internal resistance formula	Permittivity And Permeability
Wheatstone Bridge	Difference Between Primary Cell and Secondary Cell	Cells in Series and in Parallel
Ohm’s law	Relation between kva and kw	Cells, emf, Internal Resistance
Types of Circuits	Resistivity Temperature Dependence	Unit of Specific Resistance
Types of Resistors	Current Electricity Important Questions	Combination of Resistors
Resistivity formula	Derivation of Drift Velocity	Resistor Colour Codes
Types of Current	Difference Between Ammeter and Voltmeter	Unit of Current
Carbon Resistor	Difference between kva and kw	Current Electricity
Conductivity	Difference between RTD and thermocouple	Current density formula
Ampere	Differences Between Acceleration and Velocity	Current Density
Static Electricity	Difference between earth and neutral	Power Of Alternating Current
Drift Velocity	Relation between resistance and length	Ohm’s Law and its Limitations
Electromagnetic Field	Difference between emf and voltage	Physical Significance of Electric Field

CBSE CLASS XII Related Questions

1.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:
- attract with a force \( \frac{F}{2} \)
- repel with a force \( \frac{F}{2} \)
- repel with a force \( F \)
- attract with a force \( F \)
View Solution
2.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.
View Solution
3.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.
View Solution
4.
Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Both Assertion (A) and Reason (R) are false.
View Solution
5.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:
- 5 V
- 3.5 V
- 2.5 V
- Zero V
View Solution
6.
What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?
View Solution

Similar Physics Concepts

Meter Bridge: Definition, Working Principle & Examples

Potentiometer: Working Principle, Types & Applications

Ohm's Law and Its Limitations: Explanation & Applications

Cells, EMF and Internal Resistance: Equations & Examples

Combination of Cells in Series and in Parallel

Electric Current: Effects, Types and Properties

Wheatstone Bridge: Derivation, Formula & Applications

Resistors in Series and Parallel Combination: Formula and Examples

Current Electricity: Definition, Types, Formulas & SI Units

Ampere: Definition, Conversions and Ammeter

CBSE CLASS XII Previous Year Papers

Physics

Physics Preparation Guides

Electric Charges and Fields: Flux, Gauss Law & Coulomb's Law

Applications of Gauss Law: Formula & Gauss Theorem

Coulomb’s Law: Formula, Vector Form & Limitations

Electric Charge: Definition, Formula, Types and Properties

Electric Field: Definition, Formula & Electric Field Direction

Gauss Law: Formula, Gauss Theorem & Electric Flux

Dipole in a Uniform External Field: Torque, Frequency, and Time Period

Electric Dipole: Definition, Significance and Electric Dipole Moment

Electric Flux: Formula, Equation, Symbol & SI Unit

Electrostatic Potential: Definition, Formula and SI Unit

Electric Potential Due to a Point Charge: Derivation & Formula

Potential Due to an Electric Dipole: Introduction, Formula and Derivation

Equipotential Surface: Work Done, Properties & Magnitude

Van de Graaff Generator: Principle, Working, and Construction

Energy Stored in a Capacitor: Formula, Derivation and Applications

Electrostatic Potential and Capacitance: Introduction & Derivations

Electric Charges and Fields Important Questions

Kirchhoff's Laws: Kirchhoff's Current and Voltage Laws & Applications

Meter Bridge: Definition, Working Principle & Examples

Potentiometer: Working Principle, Types & Applications

Physics NCERT Solutions

Doppler Shift: Formula & Applications

Volcanoes Eruption: Definition, Formation and Causes

Alpha-Particle Scattering and Rutherford’s Nuclear Model of Atom: Explanation

Tension Formula: Explanation and Solved Examples

Pressure Formula: Partial, Osmotic & Absolute Pressure

NCERT Solutions For Class 12 Physics Chapter 1: Electric Charges and Fields

NCERT Solutions For Class 12 Physics Chapter 8: Electromagnetic Waves

NCERT Solutions For Class 12 Physics Chapter 6: Electromagnetic Induction

NCERT Solutions for Class 12 Physics Chapter 13: Nuclei

NCERT Solutions For Chapter 14: Semiconductor Electronics

Comments

No Comments To Show

SUBSCRIBE TO OUR NEWS LETTER

COLLEGE NOTIFICATIONS

EXAM NOTIFICATIONS

NEWS UPDATES

Download the Collegedunia app on

downloadapp_banner image

downloadapp_banner image

© 2026 Collegedunia Web Pvt. Ltd. All Rights Reserved