In-text Questions — Field Due to a Loop and Solenoid — Magnetic Effects of Electric Current

1. 13 marksNCERT Cl-10 Science, In-text Qs after §12.2.4, Q1

   Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

   Hint. Curl your right-hand fingers the way the current actually flows (clockwise, viewed from above) and see which way your thumb points.

   Step 1 — Apply the right-hand rule to the loop. Curling the fingers of the right hand in the clockwise direction (as viewed from above the table, matching the current) points the thumb downward, into the table.

   Step 2 — State the field inside the loop. The magnetic field inside the loop (and along its axis) therefore points vertically downward, into the plane of the table.

   Step 3 — State the field outside the loop. Since field lines form closed loops, they curve around outside the loop and point in the opposite sense there — vertically upward, completing the loop back through the top.

   ✦ Answer: Inside the loop, the field points downward (into the table); outside the loop, the field lines curve around and point upward.

   Where students slip. Giving the same direction for both inside and outside the loop — field lines form closed loops, so the direction outside is necessarily opposite to the direction inside, just as with a bar magnet.

2. 22 marksNCERT Cl-10 Science, In-text Qs after §12.2.4, Q2

   The magnetic field in a given region is uniform. Draw a diagram to represent it.

   Hint. A uniform field means the same strength and direction everywhere — the diagram should look nothing like the field around a single wire or loop.

   Step 1 — Recall what 'uniform' means for a field. A uniform field has the same magnitude and direction at every point in the region.

   Step 2 — Translate this into field lines. Equally spaced, parallel straight lines (all pointing the same direction) represent a uniform field, since equal spacing means equal strength everywhere and the lines being straight and parallel means the direction never changes.

   ✦ Answer: A set of equally spaced, parallel straight lines, all pointing in the same direction — this is exactly the pattern seen inside a current-carrying solenoid.

   Where students slip. Drawing converging or diverging lines — that pattern represents a field that changes in strength from place to place, not a uniform one.

Solutions written by the tuition.in editorial team and checked against the NCERT Class 10 Science textbook, Reprint 2026-27 (jesc112.pdf) — five in-text question sets (12 questions total) plus one end-of-chapter Exercise (9 questions, not 18 as some older manifests claim). The electric motor, electromagnetic induction and electric generator have been removed from this chapter entirely (confirmed by full-text search) — they are named once as example devices, with no construction/working explained, and don't appear in the chapter's own 'What you have learnt' summary. One exercise question (Q7(iii)) still references induced current despite this; it is answered using Fleming's right-hand rule, flagged accordingly.. Questions are referenced from the NCERT textbook for identification.