Long wire of the potentiometer gives lower value of which increase sensitivity of potentiometer

Answer

Long wire of the potentiometer gives lower value of which increase sensitivity of potentiometer
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Hint: To find the answer for the given question, first we need to know what a potentiometer is and also we need to know the sensitivity of the potentiometer. Then we find the solution why the sensitivity of the potentiometer increases.

Complete answer:

A potentiometer has three terminal resistors with sliding or in rotating which contact in form as an adjustable voltage divider. If there are only two terminals used at one end and the output it acts as a variable resistor or rheostat.A potentiometer is used to measure the instrument and it is essential a voltage divider is used for measuring an electric potential. It is used to control electrical devices such as a volume control on the audio equipment. Potentiometer can be operated by the mechanism of position transducer.If we increase the current through the potentiometer then the sensitivity will decrease. The smallest potentiometer difference can be measured using a potentiometer and so it is called sensitivity of potentiometer. Sensitivity of the potentiometer is increased only when increasing the length of the potentiometer wire. If reducing the current in circuit by the rheostat. The both of the above two methods are used in decreasing the potential gradient and by increasing the resistivity.Hence, the sensitivity of the potentiometer can be increased by increasing the length of the potentiometer.

So therefore option (B) is correct.

Note: Potentiometer is used to measure the $EMF$. It is a kind of an electrical instrument and also used to compare the $EMFs$ of the different cells and use as a variable resistor in many of the applications. Potentiometers can be classified into two important parameters like resistance and power.


Long wire of the potentiometer gives lower value of which increase sensitivity of potentiometer

Text Solution

Incresing the e.m.f. of the cellIncreasing the length of the potentiometer wire Decreasing the length of the potentiometer wireNone of the above

Answer : B

Solution : (b) The sensitivity of potentiometer can be increased by decreasing the potential gradient i.e., by increasing the length of potentiometer wire. <br> (Sensitivity `prop (1)/(P.G.)` and Length)

  1. decreasing the thickness of the potentiometer wire
  2. increasing the length of the potentiometer wire
  3. increasing the temperature of the surrounding
  4. all of the above

Answer:

The sensitivity of the potentiometer can be increased by decreasing the potential gradient.

Potentiometer

A potentiometer is defined as an instrument that is used for measuring an electromotive force (emf) by balancing emf against the potential difference that is produced by passing a known amount of current.

  • The potentiometer is an instrument used for measuring the unknown voltage by comparing it with the known voltage.
  • It can be used to determine the emf and internal resistance of the given cell and also used to compare the emf of different cells.
  • The comparative method is used by the potentiometer. The reading is more accurate in a potentiometer.
  • The basic principle of the potentiometer is that the potential drop across any section of the wire will be directly proportional to the length of the wire, provided the wire is of the uniform cross-sectional area and a uniform current flows through the wire.

What is the sensitivity of the Potentiometer?

The sensitivity of the potentiometer is defined as the smallest potential difference that is measured by using a potentiometer. The sensitivity of the potentiometer can be increased by decreasing the potential gradient. i.e., by increasing the length of the potentiometer wire.

Sensitivity of potentiometer can be increased by:

  • Increasing the length of the potentiometer wire
  • By reducing the current in the circuit by using a rheostat

Both methods help in decreasing the potential gradient and thereby increasing the resistivity.

Long wire of the potentiometer gives lower value of which increase sensitivity of potentiometer

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