plz any one i am abit confused can you answer these questions thx
05. The space surrounding a charge within which the influence of its charge extends is known as.
(a) Electric field (b) Magnetic field
(c) Line of force (d) Electric intensity
06. A region around a stationary electric charge has.
(a) Electric field (b) Magnetic field
(c) Both electric and magnetic fields. (d) Neither electric nor magnetic field.
04. When an uncharged body is placed near a charged body.
(a) Then uncharged body is attracted first and then charged by induction.
(b) Get charged by induction and then attracted towards the charging body.
(c) Gets charged by conduction.
(d) Remains as such
03. The phenomenon of an uncharged body getting charged merely by nearness of a charged body is called the.
(a) Induction (b) Attraction
(c) Magnetic effect, (d) Chemical effect.
02. If the distance between two electric charges is doubled, the force experienced between them will be.
(a) One-fourth (b) Half
(c) Double (d) four-time
01. Changes of equal magnitude are separated by some distance. If the changes are in creased by 10% to get the same force between them their separation must be.
(a) Increase by 21% (b) Increase by 10%
(c) Decreased by 10% (d) None of the above is correct well i think its 10% but any help would be great
07. The number of tubs of force passing through a surface in an electric filed is known as.
(a) Electric charge density (b) Electric flux density
(c) Electric flux (d) Magnetic flux
11. Electric potential at a point situated at a distance ‘d’ from a point charge varies as.
(a) D2 (b) 1/d
(c) 1/d2 (d) d
12. The potential inside a charged hollow sphere is.
(a) Zero (b) Same as that on the surface.
(c) Less than that on the surface (d) None of the above
13. Voltage applied across a glass dielectric produces an electric field 10 time of that of air. The dielectric constant for glass is.
(a) 0.1 (b) 10
(c) 100 (d) 0.01
14. The relation between electric intensity E voltage applied V and distance d between the plates of a parallel plate condenser is.
(a) £=£ (b) E=Vxcl.
(c) E=Zr- (d) £=Fxc/²
15. A capacitor consists of two.
(a) Conductors separated by an insulator called the dielectric.
(b) Insulators separated by a conductor.
(c) Insulators separated by a dielectric.
(d) Conductors separated by air medium only
16. In a capacitor, the electric charge is stored
(a) Metal plates. (b) Dielectric
(c) Both (a) & (b) (d) None of these.
17. If the dielectric of a capacitor is replaced by a conducting material the.
(a) Capacitor will get heated up owing to eddy currents.
(b) Plats will get short-circuited
(c) Capacitor can store infinite charge
(d) Capacitor will become very high
18. The total excess or deficiency of electrons in a body is called the.
(a) Current (b) Voltage
(c) Charge (d) Potential gradient
19. The charge on an isolated conductor resides.
(a) At the conductor surface. (b) Inside the conductor
(c) Partly at the surface and party inside the conductor.
(e) None of the above
20. The capacitance of a parallel plate capacitor is not affected by
(a) Are of plates (b) Thickness of plates.
(c) Separation between plates (d) Nature of dielectric.
21. Capacitance of a parallel plate capacitor in creases with.
(a) Increase in plate area and decrease in separation between plates.
(b) Increase in plate area and in separation between plates.
(c) Decrease in plate area and in separation between the plates.
(d) Decrease in plate area and increase in applied voltage.
22. A parallel plate capacitor has capacitance of 10 uF. If the linear dimensions of the plates are doubled and the separation between them is also doubled the value of the capacitor would be.
(a) 10 u F. (b) 20 u F
(c) 5 u F (d) 40 u F
23. The property of a material which opposes the production of magnetic flux in it is known.
(a) Mmf (b) Reluctance
(c) Permeance (d) Permittivity
24. The capacitance of a cylindrical capacitor is given as length, keeping the volume constant. The new resistance will be
(a) R/9 (b) R/3
(c) 9R (d) 3R
25. The wire is stretched to its double the length. The new resistance will be.
(a) 4-time the original resistance. (b) Double the original resistance
(c) Half the original resistance (d) One-fourth of the original resistance.
26. A length of wire having a resistance of 1 ft is cut into four equal parts and these four part are bundled together side by side to form a wire the new resistance will be.
(a) ¼ Q (b) 1/16 a.
(c) 4 a (d) 16 a
27. The resistance between the opposite faces of lm cube is found to be lft. If its length is increased to 2m, with its volume remaining the same then its resistance between the opposite face along its length is.
(a) 2 ft. (b) 4 ft
(c) 1 ft (d) 8 ft
28.A wire of length / and of circular cross-section of radius r has a resistance of R ohms. Another wire of same material and of x-sectional radius 2 r will have the same R if the length is.
(a) 2 l (b) l l l
(c) 4 l (d) l 2
29. If the diameter of the wire is halved its current carrying capacity will become about.
(a) One-fourth (b) Half
(c) Twice (d) Four-time
30. Specific resistance of a conductor depends upon.
(a) Dimensions of the conductor.
(b) Composition of conductor material
(c) Resistance of the conductor
(d) Resistance of the conductor
31. Temperature coefficient of resistance is defined as.
(a) Increase in resistance per ohm per 0 C
(b) Increase in resistance per o C
(c) Decrease in resistance per o C
(d) The ratio of decrease in resistance per o C
These are fundamental questions that you should be able to answer easily with your text but I see no attempt here by you to do so. Please tell us what your answers are and post only the ones that you are having trouble with.
Sure! I will answer each question and also explain how to get the answer.
05. The space surrounding a charge within which the influence of its charge extends is known as the electric field. Answer: (a) Electric field.
To answer this question, you need to know the concept of electric field. The electric field is a property of the space around a charged object, where other charges can experience a force. When an electric charge is present, it creates an electric field around it. Therefore, the correct answer is (a) Electric field.
06. A region around a stationary electric charge has an electric field. Answer: (a) Electric field.
To answer this question, you need to know the property of electric fields around stationary electric charges. Electric charges create an electric field around them, which extends into the surrounding space. Therefore, the correct answer is (a) Electric field.
04. When an uncharged body is placed near a charged body, it gets charged by induction and then attracted towards the charging body. Answer: (b) Gets charged by induction and then attracted towards the charging body.
To answer this question, you need to understand the process of charging by induction. When an uncharged body is brought near a charged body, the charges in the uncharged body rearrange due to the influence of the electric field of the charged body. This redistribution of charges is called charging by induction. As a result of this process, the uncharged body becomes charged and is attracted towards the charging body. Therefore, the correct answer is (b) Gets charged by induction and then attracted towards the charging body.
03. The phenomenon of an uncharged body getting charged merely by nearness of a charged body is called induction. Answer: (a) Induction.
To answer this question, you need to know the term for the phenomenon described. In this case, the phenomenon described is the charging of an uncharged body by the mere presence or nearness of a charged body. This phenomenon is called induction. Therefore, the correct answer is (a) Induction.
02. If the distance between two electric charges is doubled, the force experienced between them will be one-fourth. Answer: (a) One-fourth.
To answer this question, you need to understand the relationship between the distance between two charges and the force experienced between them. According to Coulomb's law, the force between two charges is inversely proportional to the square of the distance between them. So, if the distance between the charges is doubled, the force experienced between them will be (1/2)^2 = 1/4 of the original force. Therefore, the correct answer is (a) One-fourth.
01. Changes of equal magnitude are separated by some distance. If the charges are increased by 10% to get the same force between them, their separation must be Increased by 21%. Answer: (a) Increase by 21%.
To answer this question, you need to understand the relationship between charge, distance, and force. According to Coulomb's law, the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. If the charges are increased by 10% to get the same force between them, the distance between them must be increased as well to maintain the equilibrium. The increase in distance can be calculated using the formula: New distance = Original distance * (1 + Change in charge)^0.5. Plugging in the values, we get: New distance = Original distance * (1 + 0.1)^0.5 = Original distance * 1.1^0.5 ≈ 1.21 * Original distance. Therefore, the correct answer is (a) Increase by 21%.