JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumDiagram reading
JEE Main 4 September 2020, Shift 1, Physics Q15
Question 15 of 75 in this shift, Physics question 15 of 25.
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil ?
Three positions shown describe : (a) the magnet’s entry (b) magnet is completely inside and (c) magnet’s exit.
The figure, in words
A coil (spring-like winding) drawn horizontally with its two ends joined by a wire through a galvanometer G (circle with an upward arrow). A small rectangular bar magnet, labelled magnet, is shown at the right end of the coil with an arrow pointing left; three positions are marked: a at the right end of the coil, b inside the coil, c at the left end with a leftward arrow. Each option shows three circles labelled (a), (b), (c) joined by right-pointing arrows, each circle with a centre dot and an arrow from the centre.- (1)[figure: galvanometer needle shown as (a), (b), (c); arrow points straight up in all three]
- (2)[figure: galvanometer needle shown as (a), (b), (c); arrow points up-right in (a), straight up in (b), up-left in (c)]Official answer
- (3)[figure: galvanometer needle shown as (a), (b), (c); arrow points up-right in (a), straight down in (b), down-left in (c)]
- (4)[figure: galvanometer needle shown as (a), (b), (c); arrow points (almost) straight up in (a), straight up in (b), up-right in (c)]
Official answer
Option 2
NTA final key (Sep 2020).
- Chapter
- Electromagnetic Induction
- Topic
- Lenz's Law
- Idea tested
- Bar Magnet and Loop Interaction