Question

(a) Define one tesla.
(b) Derive an expression for force experienced by a current carrying straight conductor placed in a magnetic field. How can we find the direction of force?

Answer 1

(a)One tesla is defined as the field intensity generating one newton of force per ampere of current per meter of conductor.

(b)$F=IBlsin\Theta =I\overrightarrow{l}\times \overrightarrow{B}$

This relation arises from basic magnetic force

$F=qvBsin\Theta$

$F=q\frac{l}{t}Bsin\Theta$

$\frac{q}{t}=I$

$F=IlBsin\Theta =I\overrightarrow{l}\times \overrightarrow{B}$

The direction of force is perpendicular to $l$ and $B$

It can be found by using Fleming's right hand rule by placing your palm in direction of current and curling your finger is the direction of $B$