Why High Resistance Is Used In Potentiometer?

A high resistance is used in a potentiometer as while measuring the EMF of a cell, it does not draw any current from the source of the known EMF.

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CBSE CLASS XII Related Questions

1.
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
2.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.
View Solution
3.
A light copper ring is freely suspended by a light string. A bar magnet is held horizontally with its length along the axis of the ring. The magnet is moved towards the ring with its N pole facing the loop. What will happen to the ring and its position? Explain.
View Solution
4.
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
5.
Write any two features of nuclear forces.
View Solution
6.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.
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

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Resistors in Series and Parallel Combination: Formula and Examples

Current Electricity: Definition, Types, Formulas & SI Units

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

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Electric Field: Definition, Formula & Electric Field Direction

Gauss Law: Formula, Gauss Theorem & Electric Flux

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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

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Electrostatic Potential and Capacitance: Introduction & Derivations

Electric Charges and Fields Important Questions

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Pressure Formula: Partial, Osmotic & Absolute Pressure

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

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NCERT Solutions For Class 12 Physics Chapter 6: Electromagnetic Induction

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NCERT Solutions For Chapter 14: Semiconductor Electronics

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