MCQ
An electric potential difference will be induced between the ends of the conductor shown in the figure, if the conductor moves in the direction shown by:
- A$P$
- B$R$
- C$L$
- ✓$M$
✓
Answer
Correct option: D.
$M$
Fleming’s Right Hand Rule gives the direction of current in the conductor whenever it is moved in any magnetic field. It states that if we stretch our right hand fingers perpendicular to each other as shown in fig, then if fore finger is in the direction of Magnetic field and thumb is in the direction of motion of conductor then middle finger gives the direction of current in the conductor.
Explanation for the correct answer:
For induction of emf in the conductor, the motion of conductor should be perpendicular to the direction of magnetic field. Thus, Option $B$ and $C$ are eliminated.
Now if we move conductor in $P$ direction, the motion will be perpendicular to the direction of magnetic field but then the charge separation in the conductor will take place perpendicular to the length of the conductor. Thus, due to less space for charge separation emf can not be induced in the conductor. Thus, Option A is eliminated.
If conductor is moved in direction $M$ then the charge separation in the conductor takes place across its length, there will be enough space for charge separation. And thus emf will be induced across the conductor.
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