Can Small Dot of Magnet Can be Detected ?

hello,

you question is not clear like material you want to ask are all magnetic in nature or you want to detect or not with the device.

but it looks interesting so please clear your question more.

Sure, with a small dot of a compass.

now also it is not clear

what are you saying? explain in details not in brief

You might want to think some more about your tagline, "Knowledge is increased by sharing!!!!!!!!!!!!" For one thing, this is much too excitable. One punctuation mark is usually enough, but in special cases two or three can be used for emphasis, as in chess notation. The maximum number is four periods (three for an ellipsis plus one to end the sentence.)

If person A has some knowledge, sharing it with B does not increase A's knowledge. Indeed, it may remove some advantages for A, if B can now compete. Begging for freebies is most uncool, though it is fair to benefit from any that are offered.

hello tornado,

you might be correct but person A and B are both starters then the question asked by person A and answer given by person B by some searching and logic will definately increses the knowledge of person B.

when i am guru like yours will change my tag line definitely because then i am knowledgeable person like yours.

Hello to all, especially, everyone are kind enough and delighted to help me. Actually sharing is a return, indeed, I believe.

Apology for the ambiguous question, In fact, I wonder what kind of material can sending back the light, heat, sound, etc. which can reflection or respond by a device in certain distance ( far from the diameter of one meter ) apply on the object.

hello,

i hope you have to focus on the question asked by the CR4 user or not on the tag lines of other users.Because here we are not discussing the English grammar we are here to discuss the technical issues raised by different CR4 users.

depending on the size of the 'dot'

Oooh! Ooooh! What about a small drop of inductive pick-up coil as well?

Hey, who is that masked dog???

check out this video

video

i hope it can help you

For what purpose?

For the sake my father who has poor ability to remember the things where he placed.

A little of drop liquid ( about meter 5mm ) or any material, like paint, on the object like car's key, spectacle, etc;

The material can be traced in certain short distance ( one meter ) by hand-held electronic device, optical reflection, or even mobile phone