Chapter 4: Magnetic Effects of Electric Current

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Magnetic Effects of Electric Current

Question:

State the rule to determine the direction of a (i) magnetic field produced around a straight conductor carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.

Answer:

(i) Right Hand Thumb Rule: According to the right-hand thumb rule if we hold a current-carrying straight conductor in our right hand such that the thumb points towards the direction of current then the fingers will wrap around the conductor in the direction of the magnetic field lines.

(ii) Fleming’s Left Hand Rule: According to Fleming’s left-hand rule, if the thumb, forefinger and middle finger of the left hand are stretched such that they are mutually perpendicular to each other. The fore finger pointing in the direction of the magnetic field, the middle finger in the direction of current and the thumb will point in the direction of motion or force acting on the conductor.

(iii) Fleming’s Right Hand Rule: According to Fleming’s right-hand rule, if the thumb, forefinger and middle finger of the left hand are stretched such that they are mutually perpendicular to each other. The forefinger indicates the direction of the magnetic field and the thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current.


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