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Solution


Q.

Which of the following is not an example of the right hand thumb rule
1 D.C. motor  
2 Solenoid  
3 A.C. generator  
4 Cartesian coordinate system  

Ans.

(4)

Cartesian Coordinate system is not an example of the right-hand thumb rule. The cartesian coordinate system is used for representing points in space using three perpendicular axes (X, Y and Z). It does not involve any magnetic field, current or force so the right-hand thumb rule does not apply here.