Ncert solution class 12 physics chapter 1
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So, R is reflexive and transitive but not symmetric. To ensure very low currents drawn from the standard cell, a very high resistance of 600 kΩ is put in series with it, which is shorted close to the balance point. This defect can be corrected by using cylindrical lenses. Which is i Symmetric but neither reflexive nor transitive. Since a large current is required to start the motor of a car, the cell cannot be used to start a motor. And a charge moves continuously and does not jump from on point to the other. How much is the area of each square in the virtual image? The percentage error would be small.

If water is replaced by a liquid of refractive index 1. Answer: a When a steady current flows in a metallic conductor of non-uniform cross-section, the current flowing through the conductor is constant. Thus a charge can always be incremented or decremented in terms of e. Therefore, they are not constant. Explain how this observation is consistent with the law of conservation of charge.

Answer: It can be inferred from the given table that the ratio of voltage with current is a constant, which is equal to 19. Hence, the object distance is very little. Hence, relation R is symmetric but not reflexive or transitive. This indicates that the light rays are travelling from a denser medium to a rarer medium. Describe the nature and size of the image. At sudden breaks, the field will have more than one direction which is not possible. The image formed by the convex lens acts as an object for the concave lens.

As a result, the field of view decreases substantially. This means that the refracting system cornea and eye-lens of the eye is not working in the same way in different planes. Hence, no current would flow through the galvanometer. The answer does depend on the side of the combination at which the parallel beam of light is incident. What is the refractive index of the material of the prism? A parallel beam of light is incident on a face of the prism. This is the reason for the sparkling effect of a diamond. This is because light bends on travelling from one medium to another.

The negative sign indicates that the image is inverted and real. Answer: Note : Here we took focal Length as 10 cm because if we take it as 9 cm then image distance will be zero ,which does not make any sense. What is the steady temperature of the heating element if the room temperature is 27. Answer: a Place the two prisms beside each other. Hence, R is an equivalence relation. Charges do not get transferred infractions.

So, here we can say that the charge particles 1 and 2 which are going towards the charged particle are negatively charged. Charges and its Conservation The following questions are based on Electric Charges, units of electric charge and relation between them, quantization of electric charges, conservation of charges, electrostatics induction, etc. It acts as a perfect self-help guidance for students without any doubt. A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally removed from both. It means that every charge is an integral multiple of e, i.

Hence, R is neither reflexive, nor symmetric, nor transitive. The body may have equal amount of positive and negative charges. Similarly, all elements of the set {2, 4} are related to each other as all the elements of this subset are even. Answers of the questions are given at the end of the page. It helps the students by providing a strong foundational knowledge of the subject by making all the concepts clearer and simpler to understand. Click here to see or move to of the page or go back to main page.

Hence, the total charge possessed by a body is only in integral multiples of electric charge. Additionally, the notes include important derivations, formulas, and definition which the students can refer and study effectively. The area of cross-section of the wire is 2. Simply stated, you must have both pairs or neither Transitive Relation A relation R on a set A is called transitive if whenever a, b is in R and b, c is in R, then a, c is in R. This never happens in practice because there is a mechanism to replenish electric charges, namely the continual thunderstorms and lightning in different parts of the globe.

Hence, R is an equivalence relation. The elements in R that are related to 1 will be those elements from set A which are equal to 1. When this dispersed light is incident on the second prism, it will recombine and white light will emerge from the combination of the two prisms. Answer: a Three resistors of resistances 1 Ω, 2 Ω, and 3 Ω are combined in series. In this case, the virtual image serves as an object for the lens to produce a real image.

Would the galvanometer show any current? Therefore, to focus the needle again, the microscope should be moved up. Look up a Table of Physical Constants and determine the value of this ratio. The distance between the object and the convex lens is 40 cm. Spherical and chromatic aberrations are produced by a convex lens having a very small focal length. We will be explaining the reason behind the charge appearing in materials due to rubbing against each other just like when you rub a glass rod with a silk cloth, charge appears on both. Also mention the signification of the ratio.