Advertisements
Advertisements
Question
What is an electroscope? Describe the different stages of charging a gold leaf electroscope negatively with the help of a diagram.
Advertisements
Solution
An electroscope is a device used to detect the presence of charge and the nature of a charge on the body.
The four stages of the charging a gold leaf electroscope by induction are :
(i) Bring a positively charged rod near the cap of an electroscope. The cap will acquire a negative charge on it by induction. The leaves will diverge
(ii) Earth the electroscope by touching the cap will finger.
(iii) Remove the finger and keep the positively charged rod as such.
(iv) Now, take away the rod. The leaves will diverge because of charges induced by induction.
APPEARS IN
RELATED QUESTIONS
The incomplete diagram of an electric bell is given in Figure. Draw winding of coil on the core and complete the electric circuit in the diagram.
G-Gong, H-Hammer, A-Armature, C-Core, B-Battery.
Name one device that uses an electromagnet.
The following figure shows a coil wound around a soft iron bar XY.
- State the polarity at the ends X and Y as the switch is pressed.
- Suggest one way of increasing the strength of electromagnet so formed.
State two ways through which the strength of an electromagnet can be increased.
Name one device that uses an electromagnet.
Why is soft iron used as the core of the electromagnet in an electric bell?
Explain in detail the application of electromagnets.
Unlike magnetic poles ______ whereas like poles ______.
Explain the working of the following device.
Speaker
Explain the working of the following device.
Magnetic levitation trains.
