Class name Subject Book title Chapter number Content Created at
Class X Science Science 11 following terms does not represent electrical power in a circuit? (a) I R (b) IR (c) VI (d) V /R 3. An electric bulb is rated 220 V and 100 W. When...
Class X Science Science 11 of (i) 9 Ω, (ii) 4 Ω. 12. Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connect...
Class X Science Science 11 of cross-section? (e) Why are copper and aluminium wires usually employed for electricity transmission? 194 Science Reprint 2026-27
Class X Science Science 12 CHAPTER 12 Magnetic Effects of Electric Current n the previous Chapter on ‘Electricity’ we learnt about the heating I effects of electric current. ...
Class X Science Science 12 oersted in his honor. Reprint 2026-27 12.1 MAGNETIC FIELD AND FIELD LINES We are familiar with the fact that a compass needle gets deflected when b...
Class X Science Science 12 compass and a bar magnet. ■ Place the magnet on a sheet of white paper fixed on a drawing board, using some adhesive material. ■ Mark the boundary ...
Class X Science Science 12 field lines in Fig. 12.4). Inside the magnet, the direction of field lines is from its south pole to its north pole. Thus the magnetic field lines ...
Class X Science Science 12 deflection of the needle. You will see that now the needle moves in opposite direction, that is, towards the west [Fig. 12.5 (b)]. It means that th...
Class X Science Science 12 times. Observe the pattern of the iron filings. You would find that the iron filings align themselves showing a pattern of concentric circles aroun...
Class X Science Science 12 that the deflection in the needle decreases. Thus the magnetic field produced by a given current in the conductor decreases as the distance from it...
Class X Science Science 12 would the magnetic field lines look like? We know that the magnetic field produced by a current-carrying straight wire depends inversely on the dis...
Class X Science Science 12 Sprinkle iron filings uniformly on the cardboard. ■ Plug the key. ■ Tap the cardboard gently a few times. Note the Figure 12.9 pattern of the iron ...
Class X Science Science 12 of Electric Current 201 Reprint 2026-27 3. Choose the correct option. The magnetic field inside a long straight solenoid-carrying current (a) is ze...
Class X Science Science 12 displaced? the magnetic field. Support for the magnet is not shown here, for simplicity. The displacement of the rod in the above activity suggests...
Class X Science Science 12 instruments. Example 12.2 An electron enters a magnetic field at right angles to it, as shown in Fig. 12.14. The direction of force acting on the e...
Class X Science Science 12 and the brain. The r magnetic field inside the body forms the basis of obtaining the images of different body o parts.Thisisdoneusingatechniquecall...
Class X Science Science 12 circuits Figure 12.15 gives a schematic diagram of one of the common domestic circuits. In each separate circuit, different appliances can be conne...
Class X Science Science 12 compass needle is a small magnet. Its one end, which points towards north, is called a north pole, and the other end, which points towards south, i...
Class X Science Science 12 insulation, which is a neutral wire. The potential difference between the two is 220 V. The third is the earth wire that has green insulation and t...
Class X Science Science 12 direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight cond...
Class X Science Science 13 CHAPTER 13 Our Environment e have heard the word ‘environment’ often being used on the W television, in newspapers and by people around us. Our eld...
Class X Science Science 13 in the market. 208 Science Reprint 2026-27 ■ If we add a few aquatic plants and animals it can become a selfsustaining system. Can you think how th...
Class X Science Science 13 Activity 13.2 ■ While creating an aquarium did you take care not to put an aquatic animal which would eat others? What would have happened otherwis...
Class X Science Science 13 in forms which cannot be used again. The flow of energy between various components of the environment has been extensively studied and it has been ...
Class X Science Science 13 autotrophs. As it moves progressively through the various trophic levels it is no longer available to the previous level. Secondly,theenergyavailab...