Electric field intensity at a distance

Click For Summary

Homework Help Overview

The discussion revolves around the concept of electric field intensity in relation to power and distance, particularly focusing on how changes in power affect intensity as perceived from a point source, such as a bulb.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between power, distance, and electric field intensity, questioning the assumption that halving power directly halves intensity. Some participants note that intensity is proportional to the square of the electric field.

Discussion Status

The discussion is ongoing, with participants clarifying concepts and questioning assumptions about the relationship between power and electric field intensity. There is acknowledgment of the proportionality of intensity to the square of the electric field, indicating a productive direction in the conversation.

Contextual Notes

Participants are grappling with the implications of changing power while keeping distance constant, and how this affects the electric field intensity, highlighting potential misunderstandings in the initial assumptions made.

Jahnavi
Messages
848
Reaction score
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 .
 

Attachments

  • mcq2.jpg
    mcq2.jpg
    19.9 KB · Views: 766
Physics news on Phys.org
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
 
  • Like
Likes   Reactions: Jahnavi
Abhishek kumar said:
Intensity is propotional to square of elecric field

Thanks !
 
Jahnavi said:
Thanks !
Welcome
 

Similar threads

Replies
4
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
Replies
1
Views
2K
Replies
1
Views
2K
Replies
4
Views
4K
Replies
3
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
11
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K