gola question for 2330 exam

[kmatthews]

the force on a conductor 750mm long carrying a current of 6a placed at right angles in a filed of 1.2 tesla will be:

can someone explain to me how to work this out cant find the equation.

 

[pushrod]

F =Bil

where F= force in newtons, B=mag flux density in Tesla, i = current in amps and l = length in metres

So answer is 5.4N