Q3 of 7 Page 147

State the Motor Rule. If the directions of current in the conductor and the magnetic field are the same, in which way will the conductor move?

The motor rule is also known as the Fleming's left-hand rule.

According to Fleming's left-hand rule, if the thumb, fore-finger and middle finger of the left hand are stretched to be perpendicular to each other as shown in the illustration at left, and if the fore finger represents the direction of magnetic field, the middle finger represents the direction of current, then the thumb represents the direction of force.



More from this chapter

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1

Current is passed from south to north through a conductor placed below a freely pivoted magnetic needle.

a) To which direction will the north pole of the magnetic needle turn?


b) Which is the rule used to arrive at this inference?


c) State the rule.


d) If the current flows in the conductor in the east west direction, what do you guess about the magnetic needle? Explain.

 2

How will you determine the polarity when current is passed through a solenoid? Suggest methods for increasing the strength of the magnetic field around a current carrying solenoid.

 1

Construct a simple DC motor and show its working.

 2

Draw the lines of force around a solenoid and exhibit it.