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NCERT Class 10 Science Magnetic Effects of Electric Current: In-text questions (page 203) Solutions
AI-written, checked on 23 Oct 2026
Solutions written by Shishya, checked — not the board's official answers
Step-by-step working for every question of In-text questions (page 203) in NCERT's Class 10 Science book, chapter “Magnetic Effects of Electric Current”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.
How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.
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In-text (page 203) Q1
Which properties of a proton can change while it moves freely in a magnetic field: (a) mass (b) speed (c) velocity (d) momentum? (More than one may be correct.)
- A magnetic field pushes a moving charge at right angles to its motion.
- Such a force changes the direction of motion but not the speed, and the mass of the proton does not change.
- Velocity and momentum (mass × velocity) include direction, so they change.
Answer: (c) velocity and (d) momentum
In-text (page 203) Q2
In the experiment with rod AB in a horseshoe magnet (Activity 12.7), how is the rod's displacement affected if (i) the current is increased (ii) a stronger magnet is used (iii) the rod is longer?
- The force on the rod is larger when the current is larger, the field is stronger, or a longer length of rod is in the field.
- (i) Increasing the current increases the force, so the rod is displaced more.
- (ii) A stronger horseshoe magnet increases the force, so the displacement increases.
- (iii) A longer rod (more length inside the field) feels a larger force, so the displacement increases.
Answer: In all three cases (i), (ii) and (iii) the displacement of rod AB increases.
In-text (page 203) Q3
An alpha particle moving west is deflected north by a magnetic field. The field is (a) towards south (b) towards east (c) downward (d) upward.
- An alpha particle is positive, so its motion towards the west is a current towards the west.
- The force on it is towards the north.
- Fleming's left-hand rule: middle finger (current) west, thumb (force) north; the forefinger (field) then points vertically upward.
Answer: (d) upward
Other exercises in this chapter
- In-text questions (page 200) — 3 questions
- In-text questions (page 201) — 3 questions
- In-text questions (page 205) — 3 questions
- End-of-chapter exercises — 9 questions
← Magnetic Effects of Electric Current: notes, practice and all exercises
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