Chapter 12 · Magnetic Effects of Electric Current

NCERT Class 10 Science Chapter 12 Intext Questions (Page 203)

All 3 questions of NCERT Class 10 Science Chapter 12 Intext Questions (Page 203) — Magnetic Effects of Electric Current — in the book's order, each with its answer and a step-by-step solution.

1. Q1
   Which of the ​following ​property of ​a ​proton can ​change while it ​moves freely in a ​magnetic field? (There may be more than one correct answer.)

   1. (a)mass
   2. (b)speed
   3. (c)velocity
   4. (d)momentum
   Show answer

   (c) velocity

   (d) momentum

   Step-by-step solution →
2. Q2
   In ​Activity 12.7, how do we think ​the displacement of rod AB will ​be affected if

   1. (i)​current in rod AB is increased;
   2. (ii)a stronger horse-shoe magnet is used; and
   3. (iii)length ​of the ​rod AB is increased?
   Show answer

   In all three cases the displacement of rod AB increases, since the force $F=BIL$ increases.

   In all three cases the displacement of the rod AB increases. (i) Increasing the current in AB increases the force on it, because the force on a current-carrying conductor grows with the current, so the rod is displaced further. (ii) A stronger horse-shoe magnet gives a stronger magnetic field between its poles, which again makes the force larger and the displacement greater. (iii) A longer rod places a greater length of current-carrying conductor inside the field, so more of it is pushed, the force is larger and the displacement increases. Taking the three together, $F=BIL$, and each change increases one factor while leaving the other two alone. The direction of the displacement does not change in any case: it is still towards the left, because Fleming's left-hand rule depends on the directions of the current and the field, and neither has been reversed.

   Step-by-step solution →
3. Q3
   A positively-charged particle (alpha-particle) ​projected ​towards ​west is deflected ​towards north ​by a magnetic ​field. ​The direction of magnetic field is

   1. (a)towards south
   2. (b)towards east
   3. (c)downward
   4. (d)upward
   Show answer

   (d) upward

   Step-by-step solution →