Concept explainers
By present-day custom, the direction of
The reason for which “left − hand rule” is used for identifying the magnetic field direction when the direction of current is defined in the direction of electron’s motion.
Explanation of Solution
Introduction: In the “Right - hand rule”, if the thumb of right hand is represent the direction of electric current then the direction of curled finger represent the direction of magnetic field. The electric current is known as the rate of change of charge.
The electric current is flow in the opposite direction of electron’s motion because the electrons have negative charge and current is always move from positive to negative. According to the given condition, when the direction of current is in the direction of motion of electron then the direction of magnetic field is measure by the left − hand rule instead of right − hand rule, because the right − hand rule is applicable direction of current is opposite to electron’s motion.
Conclusion:
Hence, the left − hand rule is used because the direction of current is reversed.
Chapter 36 Solutions
Conceptual Physics: The High School Physics Program
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