To Plot the magnetic field with the help of fine iron filings (a) single bar magnet (b) two bar magnets, such that their opposite poles face each other (c) two bar magnets, such that their similar poles face each other. Materials required 1. Fine iron filings filled in a sprinkler (same kind of sprinkler used for salt or pepper). 2. A foolscap white sheet of paper. 3. Two bar magnets. 4. Two thick and wide books of same thickness. Procedure 1. Arrange the thick books in such a way that you get a flat smooth surface, wide enough for the fulls cape white sheet of paper. 2. Make a small gap between the books and insert a bar magnet between the gap. 3. Spread the white sheet of paper on the books and secure it with cello tape. 4. Sprinkle iron filings all over the paper evenly. 5. Tap the paper gently. You will observe that iron filings act like thousands of tiny magnetic compasses and align themselves along the magnetic lines of force as shown in figure Fig. 01. These lines come out of the magnet from the north pole and end up at south pole. 6. Now place two bar magnets in the gap between the books, such that north pole of one magnet is facing towards the south pole of other magnet as shown in figure : 02. Repeat the activity again and observe the magnetic field. 7. Now place two bar magnets in the gap between the books, such that north poles of both magnets face each other as shown in figure :03). Repeat the activity again and observe the magnetic field. In this case you will find that at point P, between the two norths poles there are no iron filings. It is because there is no magnetic field at P. This is called neutral point.
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Procedure (to be performed in the school laboratory)
The EJSMagnetic Field from Loops model computes the B-field created by an electric current through a straight wire, a closed loop, and a solenoid. The user can adjust the vertical position of the slice through the 3D field.
Fore More Study 1. To study the following properties of acetic acid (ethanoic acid) : (i) odour (ii) solubility in water (iii) effect on litmus (iv) reaction with sodium bicarbonate 2. To study saponification reaction for preparation of soap. 3. To study the comparative cleaning capacity of a sample of soap in soft water and hard water. 4. To determine the focal length of (i) Concave mirror (ii) Convex lens by obtaining the image of a distant object. 5. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. 6. To study (a) binary fission in Amoeba and (b) budding in yeast with the help of prepared slides. 7. To trace the path of rays of light through a glass prism. 8. To draw the images of an object formed by a convex lens, when placed at various positions. 9. To study homology and analogy with the help of preserved/available specimens of either animals or plants. 10. To identify the different parts of an embryo of a dicot seed (Pea, gram orred kidney bean)
Practical based lab manual MCQâs Experiments are listed below 1. To study the following properties of acetic acid (ethanoic acid) : i) odour ii) solubility in water iii) effect on litmus iv) reaction with sodium bicarbonate 2. To study saponification reaction for preparation of soap. 3. To study the comparative cleaning capacity of a sample of soap in soft and hard water. 4. To determine the focal length of i. Concave mirror and ii. Convex lens by obtaining the image of a distant object. 5. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. 6. To study (a) binary fission in Amoeba and (b) budding in yeast with the help of prepared slides. 7. To trace the path of the rays of light through a glass prism. 8. To draw the images of an object formed by a convex lens when placed at various positions. 9. To study homology and analogy with the help of preserved / available specimens of either animals or plants. 10. To identify the different parts of an embryo of a dicot seed ( Pea, gram or red kidney bean).
Answer: Practical based lab manual MCQâs Experiments are listed below
Focal Length of a Concave Mirror using Parallel Rays - Method I Theory
· Determine the focal length of a concave mirror – quickly with a minimum of materials. · For a spherical concave mirror – parallel rays of light focus to a point. The distance from the mirror to the focused point image is the focal length of the mirror. Materials Included: • Economy Optical Bench (Optional) • 10 cm focal length concave mirror Materials Provided by You: · Incandescent Frosted 60 Watt bulb with an F drawn on it (Optional) · A Ruler and a sheet of paper (for focusing screen) · Permanent ink (Sharpie) Pen Procedure: 1. Aim your mirror at a distant light source greater than 6 meters away in a darkened room. You can use the sun outdoors or even inside through a window. 2. Place a sheet of paper (focusing screen) between the mirror and light source so that light can strike the mirror and reflect back to the paper (see diagram below). 3. Move the paper toward and away for the mirror to find the position where the reflected light forms the image of a small spot on the paper. 4. Measure the distance between the mirror and the image on the spot with a ruler 5. Focal Length of Mirror using Method I: ______________ cm Q. While finding out the focal length of a convex lens, Ashok kept it on a stand on the optical bench at 10.5 cm. He adjusted the stand carrying the screen to obtain sharp image of a distant tree on it and finally got it when this stand was at 20.8 cm on the optical bench. The focal length of the lens is – (a) 10.3 cm (b) 10.5 cm (c) 20.8 cm (d) 5.1 cm Q.Ritu obtained a distinct image of a distant tree on the screen with the help of a concave mirror. To find focal length of the mirror she shall have to measure distance between- (a) mirror and the tree (b) screen and the tree (c) mirror and the screen (d) mirror and tree as well as between screen and the tree Q. A teacher obtains distinct image of a distant tree on a screen with the help of a convex lens and then asks her four students A,B,C, D to describe nature and size of image. Answers given by them were (A) virtual, inverted, smaller than object (B) real, inverted, smaller than object (C) virtual, erect, same size as that of object (D) real, erect, same size as that of object Correct answer was given by (a) A (b) B (c) C (d) D Q.Four students A, B, C, D traced the path of a ray of light through a glass slab as shown below. Who has traced the path correctly ? The student who has drawn correct path is. (a) (A) (b) (B) (c) (C) (d) (D) Q.After performing the experiment of tracing path of a ray of light through a glass slab, four students A,B,C, D measured angle of incidence and angle of emergence and worked out the relationship between the two as [A] < i = <e [B] < i < <e [C] < I > <e [D] <i = 1/<e Correct relationship has been obtained by (a) A (b) B (c) C (d) D Q.A teacher set up the stand carrying a convex lens of focal length 15 cm at 20.5 cm on the optical bench. She asked four students A,B,C and D to suggest the position of the screen on the optical bench so that a distinct image of a distant tree is obtained immediately on it. The positions of screen suggested by each of them were as- A ___ at 35.5 cm B ___ at 5.5 cm C ___ at 50.5 cm D ___ at 7.5 cm. Correct position of the screen was suggested by (a) A (b) B (c) C (d) D Q. For determining focal length of a concave mirror, a teacher asks her students to Identify concave mirror from a few mirrors lying on the table. The reason given by A,B,C and D for picking up the right mirror is ___ A ___ the mirror is depressed at the center and self image formed is enlarged and erect. B ___ the mirror is raised at the center and self image formed is smaller and erect C ___ the mirror is plane all over and self image is of same size D ___ the mirror is depressed at the center and self image formed is enlarged and inverted. The correct selection is taken by: (a) A (b) B (c) C (d) D Q.Students performed experiment to determine focal length of a convex lens. by obtaining image of a distant tree on the screen. Their teacher asks four students A,B,C,D to describe nature and size of image. Description given by them is ___ A ___ Image is virtual, smaller and erect B ___ Image is real, smaller and erect C ___ Image is virtual, enlarged and inverted D ___ Image is real, smaller and inverted. The correct selection is taken by: (a) A (b) B (c) C (d) D
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