Clarke constructs a device by passing current through a piece of long insulated wire wrapped around an iron core. He uses this device for picking paper clips. What is the name of the device constructed by Clarke?
If a soft iron is placed inside the current carrying coil, what is the name given to the device?
What name is given to the following arrangement ? A coil of insulated copper wire wrapped around an iron piece and connected to an electric cell.
Fill in the following blanks with suitable words : A current-carrying coil of an insulated wire wrapped around a piece of iron is called ___________.
Your teacher has shown you the following activity. Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure The current is switched on and some pins are placed near the ends of the nail. Write down any three questions that come to your mind about this activity.
A steel bar is magnetized by keeping it inside a long coil of insulated copper wire and passing a current through the coil. Discuss what happen to the pole strength of the magnet as the time for which the electric current passes through the coil increases.
Dinesh is a student of 10th standard. He went to a remote area of Rajasthan for trekking with his friends. Dinesh found that it was a sparsely inhabited area. He was surprised to know that there was still no electricity in this area. The children also had to study with kerosene lamps at night. The village farmers used diesel to run irrigation pumps. Actually, there were no power transmission lines which could bring electricity to this remote area. Dinesh was really disturbed by the living conditions of the people in this part of Rajasthan. One day Dinesh gathered all the people of village in the village school. He told them that if they put pressure on their area MLAs and MP for making available the required funds, then he could tell them about the devices to light up their homes and streets at night, play radio and television and also run irrigation pumps with electricity without there being power transmission lines. All the people agreed and Dinesh described them the devices to get electricity in their area in detail. The village people were very happy to know this and soon they got electricity in their area. (a) What was the device described by Dinesh to the village people to obtain electricity locally ? (b) What source of energy is made use of in this device to obtain electricity ? (c) Why do you think this device is more appropriate for an area like Rajasthan ? (d) What is the name of the single unit of this device ? What values are shown by Dinesh in this incident ?
BEIITIANS-ELECTRIC CURRENT AND ITS EFFECTS-IIT JEE WORKSHEET (V. Matrix Matching)
