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Table of Contents

Questions / Notes

Text Alerts and Descriptions Diagram

The diagram below is an illustration of the various text alerts, descriptions, and updates.

Text Alerts

Movement Alerts

Magnet Focus Alert (First time focusing)

  • "Magnet [location] of Play Area. W A S D keys moves magnet. Number 1, 2, or 3 keys slides magnet."

Magnet Focus Alert (after first time focusing)

  • "Magnet [location] of Play Area."

Initial step made after: focusing; step direction change; or step size change

  • "[step size] step  [step direction]."
  • Note: there is no alert for steps made after an initial step. Subsequent steps will have a magnet move sonification mapped to velocity.

Slide start alert: on release of 1, 2, or 3 key press

  • "[slide speed] sliding magnet  [slide direction]. Press Space to stop slide."

Slide stop alert: Space bar is pressed, bumped into a coil or reached edge of play area

  • "Sliding stopped. Magnet [location] of play area."

Sliding in progress

  • Note: there is no alert for sliding in progress as there will be a magnet move sonification mapped to velocity.

Coil bump alert

  • "Bumping [number coils] coil."

Location Alerts

Location change alert: magnet transitions from one location region into another


  • "[location] of play area."


Coil proximity change alert: magnet transitions from one coil proximity region into another


  • Single coil: "[coil proximity] 4-loop coil."
  • Both coils: "[coil proximity] 4-loop coil. [coil proximity] 2-loop coil."
  • (info) Alert Frequency: This alert is omitted if the user's action will trigger an Entrance Direction or Exiting Coil alert.


Coil proximity change event with magnetic field enabled


  • Single coil: "[coil proximity] 4-loop coil. [field strength] magnetic field passing through."
  • Both coils: "[coil proximity] 4-loop coil. [field strength] magnetic field passing through. [coil proximity] 2-loop coil and [field strength] magnetic field passing through."
  • (info) Alert Frequency: This alert is omitted if the user's action will trigger an Entrance Direction or Exiting Coil alert.


Coil Entrance Direction Alert


  • "[number coils] coil to [left / right]."
  • "Coil no longer to [left / right]."
  • (info) Alert Frequency: this alert should occur only once and during the transition into the region.

Exiting Coil Alert

  • "Exiting [number coils] coil."

Sim Controls Alerts

Volt meter: adding / removing

  • Adding Volt Meter: "Connecting volt meter to circuit"
  • Removing Volt meteter: "Removing volt meter from circuit"

Magnetic field: show / hide

  • Showing field lines single coil:
    • "Showing magnetic field lines. [field strength] magnetic field passing through 4 loop coil."
  • Showing field lines both coils with DIFFERENT intensities:
    • "Showing magnetic field lines. [field strength] magnetic field passing through 4 loop coil. [field strength] magnetic field passing through 2 loop coil."
  • Showing field lines both coils with SAME intensities:
    • "Showing magnetic field lines. [field strength] magnetic field passing through both 4 loop and 2 loop coils."
  • Hiding field lines: "Hiding magnetic field lines.

Coil mode change alert:

  • Change from one to two coils: "Circuit now has two coils."
  • Change from two to one coil: "Circuit now has one coil."

Rotate magnet

  • "Flipping magnet: North pole is now on ['left' / 'right']. South pole now on ['right' / 'left']."

Rotate magnet: with visible field lines

  • "Flipping magnet and its magnetic field: North pole is now on ['left' / 'right']. South pole now on ['right' / 'left']."
  • Remark: This is the same description as a regular "Rotate Magnet" alert text with the addition of "and its magnetic field".

Text Alert Descriptor Values

location:

  • top-left
  • top-center
  • top-right
  • middle-left
  • middle-right
  • center
  • bottom-left
  • bottom-center
  • bottom-right

step direction:

  • left
  • right
  • up
  • down

step size:

  • regular (default)
  • large (if CTRL modifier pressed)
  • small (if Shift modifier pressed)

slide direction:

  • left
  • right

slide speed:

  • slowly (1 key pressed)
  • normally (2 key pressed)
  • quickly (3 key pressed)

coil proximity:

  • Far from
  • Close to
  • Very close to
  • In

field strength:

  • Very strong
  • Strong
  • Weak
  • Very weak
  • Minimal

number coils:

  • 2 loop
  • 4 loop


Static and Dynamic Text Descriptions

Scene Summary (h2)

Faraday's Law is an interactive sim. It changes as you play with it.

The play area has a light bulb circuit, and a moveable bar magnet. There are controls that change what is connected to the circuit,  flip the bar magnet, and reset the sim.

Move the magnet to play.

Play Area (h2)

Light Bulb Circuit (h3)

(If just 4 loop coil attached)

In circuit are a light bulb and 4 loop coil. The coil is open on the left and right - the bar magnet can pass through.

(If 2 loop or volt meter attached)
In circuit are a:

  • 4 loop coil
  • 2 loop coil (if enabled)
  • Volt meter (if enabled)

The coils are open on the left and right - the bar magnet to pass through.

(Static)

Controls:

  • Checkbox: Connect volt meter to circuit
  • Checkbox: Show field
  • Button group: "Circuit mode"
    • Option 1 (default): "1 coil"
    • Option 2: "2 coils"

Bar Magnet (h3)

(If just 4 loop coil attached)

The bar magnet is at the [ location ] of the Play Area.

(If 2 loop coil attached)

The bar magnet is:

  • [ location ] of the Play Area
  • [proximity] to the 4 loop coil.
  • [proximity] to the 2 loop coil.

Magnet polarity:

  • North on the [left / right]
  • South on the [right / left].

Button: flip magnet (Help text: "Flip North and South poles")

(If field lines visible) Field Lines (h3)

Magnetic field lines go around from North end on [right / left] side of magnet, to South end on [left / right] side of magnet.

(If just 4 loop coil attached)

From the magnet's position, a[field strength] magnetic field is passing through the 4 loop coil.

(If 2 loop coil attached)

The magnet field strength is:

  • [field strength] at the 4 loop coil.
  • [field strength] at the 2 loop coil.

Keyboard Access

Magnet can be moved 2 ways: by moving by steps, and sliding.


Moving by steps

  1. Press Tab to focus the magnet.
  2. WASD direction indicators appear.
  3. Pressing a direction will move magnet one step.
  4. Modifier CTRL will make the magnet move a larger step.
  5. Modifier Shift will make the magnet move a smaller step.

WASD Indicator behaviour

Like BASE, WASD indicators disappear once the magnet moves. WASD indicators reappear if focus is moved off magnet and back again.


Moving by Sliding


  1. Tab to focus the magnet.
  2. User can press a slide key 1, 2, or 3 to slide the magnet to the other side of the play area.
    1. 1 = slow jump
    2. 2 = normal speed jump
    3. 3 = quick speed jump.
  3. While a slide key is depressed and while the magnet is sliding
    1. a faded placeholder image of the magnet is shown where the magnet will eventually stop.
    2. an arrow indicates the speed and direction of the movement. 1 arrow = slow slide, 2 arrows = normal slide, 3 arrows = quick slide.
  4. If focus is moved off the magnet in the middle of a slide, the magnet will stop and a magnet stop alert is fired.

Edge Cases

Sliding with bumping into a coil


If initiating a slide and the magnet will bump into the coil, while the placeholder is visible, it will appear next to the coil where it will stop.

Movement Starting with Coil Obstruction


A special case where the magnet is starting from a position where it is blocked from sliding or stepping by the coil. A number of things will happen:

  • Magnet stays where it is - there is no movement of the magnet in the direction of the coil.
  • A "coil bump alert" will be fired.
  • Audio feedback will be heard (the coil bump earcon).

2 Loop Coil Configuration Switching

A couple ideas for a coil configuration toggle.

Also see: https://github.com/phetsims/faradays-law/issues/99

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