Shared by a Veda teacher · Generated with Veda AI
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
The oldest sensor in science
A compass is a small magnet pivoted to swing freely. It settles along the local magnetic field — Earth's, or any magnet's brought near. Its north-pointing end defines the field's direction at that point.
↳ Wherever the compass's N points, that's the field direction.
Rules every magnet obeys
↳ Repulsion, not attraction, proves something is a magnet.
The invisible region of influence
Direction at any point = the direction a compass needle's north pole takes when placed there.
↳ A field is a region of influence with strength AND direction.
No poles — just circles
A straight current-carrying wire is wrapped in concentric circles of magnetic field, centred on the wire, lying in planes perpendicular to it. Iron filings on a cardboard around the wire snap into these rings.
↳ Straight wire → circular field lines around it.
Your right hand is the instrument
↳ Thumb = current; curled fingers = field.
Two dials of strength
↳ More current = stronger; more distance = weaker.
The compass needle, what a magnetic field is, how to draw and read field lines, their five golden properties, and Oersted's discovery that current makes magnetism.
~25 min · full explanation, examples & memory tricks in the app
The circular field of a straight wire, the right-hand thumb rule, the field of a circular loop, the bar-magnet-like solenoid, and the electromagnet.
~35 min · full explanation, examples & memory tricks in the app
Why a magnet pushes a current-carrying wire, the rod-on-rails experiment, Fleming's left-hand rule, when the force is maximum or zero, and where this force runs your world — motors, speakers, fans.
~30 min · full explanation, examples & memory tricks in the app
Live, neutral and earth wires, how a house is wired, earthing, short circuits, overloading, fuses and MCBs — the safety topic every board paper touches.
~30 min · full explanation, examples & memory tricks in the app
216 questions laddered from warm-up to topper-level, each with an explanation. A taste:
Consider these statements about a magnetic field. I. It is the region in which a magnet's force can be detected. II. It has both a magnitude and a direction at every point. III. Its direction at a point is where a compass needle's north pole points. IV. It exists only outside the magnet, not inside it. Which statements are correct?
AdvancedI, II and III only
I, II and III are correct. IV is false — the field continues inside the magnet, running from south to north, which is what closes every field line into a loop.
The direction of a magnetic field at a point is given by the direction of the:
Beginnernorth pole of a compass placed there
The compass's north end points along the field.
A field line is traced with a plotting compass, starting at the north pole of a bar magnet. Following it all the way round, the line returns to its starting point after passing:
Advancedinto the south pole and then through the magnet itself from south to north
Outside, the line runs N to S; inside the magnet it runs S to N. That is what makes it a closed loop with no beginning and no end.
Why must magnetic field lines form closed loops, when electric field lines can simply begin and end on charges?
Advancedbecause isolated magnetic poles do not exist, so a line has nowhere to begin or end
An electric field line starts on a positive charge and ends on a negative one. No isolated magnetic pole has ever been found, so a magnetic line has no such terminus and must close on itself.
80 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
The full Veda Bites deck, complete notes, spaced-repetition flashcards, leveled MCQs, tests and games for this kit — plus Daily Facts and the Arena, every day.
