I Would like to know which physical quantity this is, it is defined as a ratio of Force to the current. Please anyone who knows help me

 

In electric motors it is the Torque Constant, aka K-sub-T. This constant which depends on a number of factors involving motor geometry and constuction is actually the ratio of torque to current. It does not have a unit name AFAIK

 

An Ampere is 200 nanoNewtons per meter, so I think the answer is "meter."

 

Hello,

Take a look at this page on Magnetism: quantities units and ralationships.
http://info.ee.surrey.ac.uk/Workshop/advice/coils/terms.html

Greetings,
Bertus

 

An Ampere is 200 nanoNewtons per meter, so I think the answer is "meter."

I'll second the "metre" as the answer.

Dave

 

NO comment

 

Electromotive force divided by current = resistance (units of ohms).