Shown is an apparatus for studying the properties of electrons. Electrons from an emitter F pass through a hole in G and then move into a region where crossed electric (L) and magnetic (M) fields are applied. The spacing between the electric field plates at L is 1 mm. Various target materials can be placed at W. The electrons are detected at a phosphor coated screen labeled x-y. One scale unit on the screen equals 1 cm.
Fill in the number of the component that identifies the lettered object in the diagram. A number may be used more than once.
Components:
1. cathode, 2. voltmeter, 3. variable resistor
4. variable capacitor,
5. variable inductor,
6. ammeter,
7. anode,
8. battery,
9. electroscope,
10. oscillator.
A___ ... B___ ... C___ ... D___ ... E___ ... F___ ... G___ ...