CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

A copper wire is held between the poles of a magnet

Question 14 - A copper wire is held - teachoo.jpg

The current in the wire can be reversed. The pole of the magnet can also be changed

over. In how many of the four directions shown can the force act on the wire?

 

  1.  1
  2.  2
  3.  3
  4.  4

 

Answer:

By using the Flemming’s left hand rule, two conclusions can be drawn:

  1. When the direction of current is kept constant (fixed in either direction), the magnetic field can be varied in 2 directions (W-E, E-W).
    The resultant force on  the wire can be in 2 directions: upwards or downwards (N or S) (respectively)
  2. When the direction of magnetic field is kept constant (fixed in either direction), the current can be varied in 2 directions (inwards and outwards).
    The resultant force on  the wire can be in 2 directions: upwards or downwards (N or S) (respectively)

flemings-left-hand-rule---teachoo.png

Therefore, the correct answer is (b) 2 (Either North or South)

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo