Science
(i) State the rule used to find the force acting on a current carrying conductor placed in a magnetic field.
(ii) Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be
(1) maximum
(2) minimum respectively.
Give reason for your answer.
Electro-Magnetism
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Answer
(i) Fleming's left hand rule is used to find the direction of force acting on a current carrying conductor, placed in a magnetic field.
According to this rule : Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If the forefinger points in the direction of magnetic field and the middle finger in the direction of current, then the thumb will point in the direction of motion or force acting on conductor.
(ii) (1) Force on electron is maximum in case (i) because here direction of motion of electron is at right angles to the magnetic field.
(2) Force on electron is minimum in case (iii) because here direction of motion of electron is along the direction of the magnetic field.
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