Question:

In a potentiometer of $10$ wires, the balance point is obtained on the $7^{th}$ wire. To shift the balance point to $9^{th}$ wire, we should

Updated On: Jun 23, 2023
  • decrease resistance in the main circuit
  • increase resistance in the main circuit
  • decrease resistance in series with the cell whose emf is to be measured
  • increase resistance in series with the cell whose emf is to be determined
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The Correct Option is B

Solution and Explanation

In order to shift the balance point to the 9 th wire , the potential gradient of the wire should be decreased so that the balance point shifts further. This can happen when the current in the main circuit is decreased. The current in the circuit can be decreased by increasing the resistance of the main circuit.
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Notes on Current electricity

Concepts Used:

Current Electricity

Current electricity is defined as the flow of electrons from one section of the circuit to another.

Types of Current Electricity

There are two types of current electricity as follows:

Direct Current

The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.

Alternating Current

The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.