Question

 Dimpi's class was shown a video on effects of magnetic field on a current carrying straight conductor. She noticed that the force on the straight current carrying conductor becomes zero when it is oriented parallel to the magnetic field and this force becomes maximum when it is perpendicular to the field. She shared this interesting information with her grandfather in the evening. The grandfather could immediately relate it to something similar in real life situations. He explained it to Dimpi that similar things happen in real life too. When we align and orient our thinking and actions in an adaptive and accommodating way, our lives become more peaceful and happy. However, when we adopt an unaccommodating and stubborn attitude, life becomes troubled and miserable. We should therefore always be careful in our responses to different situations in life and avoid unnecessary conflicts. 

Answer the following question based on above information:

(i) Express the force acting on a straight current carrying conductor kept in a magnetic field in vector form. State the rule used to find the direction of this force.

(ii) Which one value is displayed and conveyed by the grandfather as well as Dimpi ?

(iii) Mention one specific situation from your own life which reflects similar values shown by you towards your elders.

Answer 1

(i) vector F = I(vector l x vector B), where vector l is a vector of magnitude l, the length of the rod, and with a direction identical to the current I. Note that the current I is not a vector. According to the Fleming's left hand rule, vector B must act horizontally in a direction perpendicular to the wire carrying current.

(ii) Adaptation to different situations and flexible and adjustable attitude.

Sharing excitement in classroom; learning with family members.

(iii) Avoiding unnecessary arguments in conflicting situations in everyday life.