Electric field intensity at a distance

In summary, the conversation discusses the relationship between power, intensity, and distance in regards to radiation from a light bulb. It is noted that at a constant distance, if the power is halved, the intensity should also be halved. However, it is determined that this is incorrect and the correct relationship is that intensity is proportional to the square of the electric field. This is followed by a brief exchange of thanks and greetings.
  • #1
Jahnavi
848
102

Homework Statement


mcq2.jpg


Homework Equations

The Attempt at a Solution



The radiations from the bulb spread radially outwards such that "Power at a distance r" = Power radiated/4πr2 .

If distance is unchanged and power halved then the intensity should also be halved .

From this I get E' = E/2 .

But this is wrong .
 

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  • #2
Jahnavi said:

Homework Statement


View attachment 217104

Homework Equations

The Attempt at a Solution



The radiations from the bulb spread radially outwards such that "Power at a distance r" = Power radiated/4πr2 .

If distance is unchanged and power halved then the intensity should also be halved .

From this I get E' = E/2 .

But this is wrong .
Intensity is propotional to square of elecric field
 
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Likes Jahnavi
  • #3
Abhishek kumar said:
Intensity is propotional to square of elecric field

Thanks !
 
  • #4
Jahnavi said:
Thanks !
Welcome
 

What is electric field intensity at a distance?

Electric field intensity at a distance is a measure of the strength of an electric field at a specific distance from a charged object. It is measured in volts per meter (V/m).

How is electric field intensity at a distance calculated?

Electric field intensity at a distance is calculated by dividing the electric force exerted by a charged object by the distance between the charged object and the point where the electric field is being measured.

What factors can affect the electric field intensity at a distance?

The electric field intensity at a distance can be affected by the amount of charge on the object, the distance from the object, and the presence of other nearby charged objects.

How is electric field intensity at a distance related to electric potential?

Electric field intensity at a distance is directly related to electric potential. The electric potential at a point is equal to the electric field intensity multiplied by the distance from the source of the electric field.

Why is electric field intensity at a distance important?

Electric field intensity at a distance is important because it helps us understand and quantify the strength and behavior of electric fields. This is crucial in many fields, including physics, engineering, and telecommunications.

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