Unit D Fields

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January 21, 2026

Course Curriculum

D.1 Gravitational fields

Comparison of Gravitational force exerted on two moons by same planet

02:28
Derive an expression of escape velocity in terms of field strength (for HL)

03:18
Position between Earth & Moon where net field strength is zero

01:51
Comparing Time periods & Energies of two satellites (for HL)

03:34
Definition of gravitational field strength

01:57
Find fundamental unit of gravitational potential

01:36
Find height where orbital velocity is half of escape velocity (for HL)

02:28
find Gravitational field strength at some distance from earth

01:44
Find ratio of orbital velocities of two satellites around different planets (for HL)

02:04
Find orbital velocity at height equal to radius of Earth

01:42
Work done on satellite to move from one orbit to other (for HL)

02:51
Find gravitational field strength at surfaces of two planets

03:12
Energy changes when a satellite is moved from one orbit to other (for HL)

04:48
Ratio of gravitational field strengths at two positions

03:04
comparison of escape velocities on Earth & Moon (for HL)

02:00
Find orbital velocity in terms of escape velocity at certain height (for HL)

01:48
Newton’s law of gravitation graph

01:43
Newton’s law of gravitation & Newton’s third law

02:49
Gravitational potentials of two equipotential surfaces (for HL)

02:26
Benifit of Newton’s law of gravitation

02:20
Equipotential surface, gravitational potential & energy (for HL)

03:32
Energies of two satellites in different orbits (for HL)

03:42
Ratio of escape speeds at surfaces of Moon and Earth (for HL)

01:50
Gravitational potential & work done (for HL)

02:17
Find position where two field strengths are equal

03:08
Comparison of escape speeds of two planets (for HL)

03:22

D.2 Electric and magnetic fields

Find direction of resultant electric field strength due to three charges

03:26
A particle of mass ”m” is in equilibrium in electric field

03:39
Determine direction of Electric field and electric force

02:03
Find ratio of two charges (a charge is placed between two similiar charges)

03:03
Find direction of electric force due to 4 charges at a point

03:09
Find charge quantity in uniform electric field

01:52
Calculate magnitude of Electric field strength & force

02:03
Work done on charge and its acceleration (for HL)

03:32
Use of magnetic field lines

02:24
Find change in potential in uniform electric field

02:30
Find Resultant field strength between two opposite charges

02:31
Electric force & Equipotential surface (for HL)

02:00
Calculate work on charge in uniform Electric field

02:22
Electric field strength vs distance graph

02:06
Gain in kinetic energy & work done on charge (for HL)

02:32
Work done on charge in uniform electric field (for HL)

01:13
Change in electric potential energy (for HL)

02:19
Charge to mass ratio of different charges

02:22
Charge in equilibrium in electric field

03:10
Coulomb’s law (change in force when distance is increased)

01:31
A charge is thrown in electric field

01:41
Electric field strength as a potential gradient (for HL)

03:14
Find equivalent Electric potential due to four charges (for HL)

03:57
Derive velocity using Coulomb’s force between electron and nucleus

01:45
Trajectory of electron in electric field

02:32
Work done on charge & Equipotential surface (for HL)

02:40
Identify correct pattern of electric field

01:42
Gradient of Potential – distance graph (for HL)

03:59

D.3 Motion in electromagnetic fields

Magnetic force exerted on wire when it is rotated in a plane

03:27
Electric and magnetic field applied in a region and charge is placed

03:39
Magnetic Force vs time graph when current carrying coil is placed in mag field

04:27
Effect on radius of current carrying coil placed in magnetic field

03:09
A charge is placed in solenoid where magnetic field is uniform

02:42
Magnetic force exerted on electron due to field produced by current wire

02:04
Magnetic force behaving as a centripetal force

03:19
Magnetic field pattern when two current carrying wires are placed parallel

02:00
Visualization of magnetic force exerted on current carrying wire by external field

02:15
Determining direction of magnetic force on an electron in magnetic field

02:47
Mutual force between two current carrying wires

03:11
Force on current carrying wire by Earth’s mag field

02:00
Calculate amount of current when wire placed in mag field

02:37
Speed at which charge go undeflected (velocity selector)

03:29
Reason why magnetic force exert in specific direction

02:45
Determine direction of magnetic force

02:44
In which direction charge will deflect?

02:22
Find direction of resultant magnetic field due to two current wires

04:25
Magnetic force behaving as a centripetal force

03:00
Find direction of resultant magnetic field due to two wires

03:08

D.4 Induction (for HL)

Draw induced emf – time graph from flux-time graph

03:23
Find speed of conducting bar (motional emf problem)

02:58
Calculate induced emf using Faraday’s law

03:24
Lenz’s law & law of conservation of energy

02:50
Draw induced current – time graph

03:29
Identify correct Induced emf – time graph

02:58
Emf & flux-time graph

01:50
Determine direction of current using Lenz’s law

03:07
In what direction current is induced when placed closed to another coil

03:58
Draw Induced emf vs time graph

04:02
How the field & emf in induced by one coil by other attched with battery

04:54
EMF-time graph when rectangular coil is passed through magnetic field

03:37
Find induced emf when a coil is rotated by 180 degrees

04:11

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Unit D Fields

Description

Subscriptions

Course Curriculum

D.1 Gravitational fields

Comparison of Gravitational force exerted on two moons by same planet

Comparing Time periods & Energies of two satellites (for HL)

Definition of gravitational field strength

Find fundamental unit of gravitational potential

Find height where orbital velocity is half of escape velocity (for HL)

find Gravitational field strength at some distance from earth

Find ratio of orbital velocities of two satellites around different planets (for HL)

Find orbital velocity at height equal to radius of Earth

Work done on satellite to move from one orbit to other (for HL)

Find gravitational field strength at surfaces of two planets

Energy changes when a satellite is moved from one orbit to other (for HL)

Ratio of gravitational field strengths at two positions

comparison of escape velocities on Earth & Moon (for HL)

Find orbital velocity in terms of escape velocity at certain height (for HL)

Newton’s law of gravitation graph

Newton’s law of gravitation & Newton’s third law

Gravitational potentials of two equipotential surfaces (for HL)

Benifit of Newton’s law of gravitation

Equipotential surface, gravitational potential & energy (for HL)

Energies of two satellites in different orbits (for HL)

Ratio of escape speeds at surfaces of Moon and Earth (for HL)

Gravitational potential & work done (for HL)

Find position where two field strengths are equal

Comparison of escape speeds of two planets (for HL)

D.2 Electric and magnetic fields

Determine direction of Electric field and electric force

Find ratio of two charges (a charge is placed between two similiar charges)

Find direction of electric force due to 4 charges at a point

Find charge quantity in uniform electric field

Calculate magnitude of Electric field strength & force

Use of magnetic field lines

Find change in potential in uniform electric field

Find Resultant field strength between two opposite charges

Electric force & Equipotential surface (for HL)

Calculate work on charge in uniform Electric field

Electric field strength vs distance graph

Gain in kinetic energy & work done on charge (for HL)

Work done on charge in uniform electric field (for HL)

Change in electric potential energy (for HL)

Charge to mass ratio of different charges

Charge in equilibrium in electric field

Coulomb’s law (change in force when distance is increased)

A charge is thrown in electric field

Electric field strength as a potential gradient (for HL)

Derive velocity using Coulomb’s force between electron and nucleus

Trajectory of electron in electric field

Work done on charge & Equipotential surface (for HL)

Identify correct pattern of electric field

Gradient of Potential – distance graph (for HL)

D.3 Motion in electromagnetic fields

Electric and magnetic field applied in a region and charge is placed

Effect on radius of current carrying coil placed in magnetic field

A charge is placed in solenoid where magnetic field is uniform

Magnetic force exerted on electron due to field produced by current wire

Visualization of magnetic force exerted on current carrying wire by external field

Determining direction of magnetic force on an electron in magnetic field

Mutual force between two current carrying wires

Force on current carrying wire by Earth’s mag field

Calculate amount of current when wire placed in mag field

Reason why magnetic force exert in specific direction