Physics (Essay) Paper 2 WASSCE (PC), 2018

Question 3

 

 

A straight conductor of length 20.0 cm carries a current of 2.0 A. If it is placed in a uniform magnetic field of flux density 0.2 T at 45o to the direction of the field, calculate the magnitude of the magnetic force on the wire.

 

Observation

 

This is a popular question among candidates. Majority of the candidates showed their strength in the area of magnetic field. Performance good.
 
The expected answer is:

F = IBlsin θ                                                                                                    
= 2.0 x 0.2 x 0.2 x sin 45 

  = 0.057 N