Question:

Electric appliances with metallic body e.g., heaters, presses etc., have three pin connections, whereas an electric bulb has a two pin connection. Three pin connections reduce heating of connecting cables.

Updated On: Jun 23, 2023
  • If both A and and Reason are true and Reason is the correct explanation of Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • If Assertion is true but Reason is false
  • If Assertion is false but Reason is true
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The Correct Option is C

Solution and Explanation

The buoyancy of an object is the resultant of all the contact forces that are present at the points of contact of the body and hence the force of buoyancy depends upon the area of contact of the body with the fluid. The force of buoyancy is more in case of the needle than in the case of the ball. Now it might so happen that the force of buoyancy $(B)$ is greater than the weight $(m g)$ of the needle, in which case the needle might float. But in the case of the ball, $ B< m g$, and so the ball sinks.
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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.