Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following is used to determine the direction of a magnetic field in a current carrying conductor?
Left-hand thumb rule
Right-hand thumb rule
Right-hand palm rule
Left-hand palm rule
Right-hand thumb rule
Quick Trick: Remember: THUMB gives the direction of Current, and CURLED FINGERS give the direction of Magnetic Field lines тАФ this is the Right-Hand Thumb Rule.
Remember: THUMB gives the direction of Current, and CURLED FINGERS give the direction of Magnetic Field lines тАФ this is the Right-Hand Thumb Rule.
Identify the Physical Phenomenon
The question asks for the rule that determines the direction of magnetic field lines around a straight current-carrying conductor.
Apply standard physics rules
Imagine holding a current-carrying straight conductor in your right hand such that the thumb points in the direction of current. Then, your fingers wrapped around the conductor point in the direction of the magnetic field lines. This is known as the Right-Hand Thumb Rule.
Differentiate from related rules
Fleming's Left-Hand Rule is used for magnetic force on a moving charge/conductor, and Fleming's Right-Hand Rule is used for induced current. Neither of those is called a palm rule or thumb rule for field lines.
A: Left-hand thumb rule is not a standard physics rule for magnetic field direction around a straight conductor. C & D: Right-hand and Left-hand palm rules are used for determining force direction in magnetic fields, not field line curvature around a current-carrying wire.
B is correct because the Right-Hand Thumb Rule specifically gives the direction of magnetic field lines surrounding a straight current-carrying wire.
Do not confuse the Right-Hand Thumb Rule (used for field direction) with Fleming's Left-Hand Rule (used for Force/Motion) or Fleming's Right-Hand Rule (used for Induced Current).