## 9th and 10th activity class

On Tuesday 9th and 10th had activity class. Children from 10th wanted to make a magnifying glass. They took a plastic bottle and carefully cut out two circles. They joined those two circles at the edge using glue gun and left a small gap. They dip it into a glass of water and filled it. But they found that the water was leaking. They tried it again using Fevistick. Their exploration creative ideas were really inspiring. With the remaining parts of the water bottle that was been cut were been joined together and formed a mini water bottle.They put some mud inside the bottle and kept a flower and few grass and made it as a flower vase.

On the other hand a 9th student had a mobile phone which was not working. He found that the battery was not charging properly.One of the wire that goes to the battery was broken. He soldered it and charged the battery and turned it on. It was great to see that the mobile gave and sound and turned on. He called everyone who were there in the room and showed them that he made it to work. He was so happy to see that it was working.

## Making Homopolar motor with 7th graders

Janani and Vishal made a homopolar motor. Janani got excited when she saw this experiment online and she wanted to build one on her own.

Making:

Materials needed: 1*AA battery, 3*neodymium magnet, Coper wire of length30cm.

Step 1: Place the three magnets at the negative terminal of the battery.

Step 2: Bend the coper wire as shown in the figure. Make sure it is not insulated, if so please scratch the wire till you get rid of the enamel.

Step3: Put all of them together. Place the coper bend wire on top of the positive terminal of the battery and other end touching the negative terminal of the battery.

Take a look at the video:

• The current in this homopolar motor flows in the presence of a magnetic field. When a current flows in a magnetic field, it will experience something known as the Lorentz force. The Lorentz force is what causes the wire to spin around the battery.[1]
• The wire connects to the battery at three points. One point of the wire is on the positive terminal, and the two ends of the wire are near the magnet, on the negative terminal. The current flows out of the positive terminal and down both sides of the wire. The magnetic field pushes the current outwards, causing the wires to rotate.[2]

sources:

## Silicon Structure

Arun and I, we wanted to make a 3D Silicon structure using Judo Straws to see how it is structured. We found the below video on You Tube and replicated the same

One silicon atom has four shared oxygen atoms. The centre part(the four green straws joining together) inside the cube are Silicon atoms and the corners of the cube are each 4 shared oxygen atoms.