Electric current indicates electric charges in motion. Dynamics deals with bodies in motion. The science of electricity in motion is known as electrodynamics The voltmeter is a high-resistance galvanometer used to measure voltage. It measures the potential difference across any two points in an electric circuit and must always be connected in parallel that is, connected by means of a wire to either side of the device across which the voltage drop is to be measured. The ammeter (A) is connected in series in the circuit so that all current passing through the circuit must pass through and be measured by the ammeter. ![]()
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10th Electricity Study Notes based on NCERT Book Download File 10th Electricity- CBSE FA Test Paper Download File 10th Solved Numerical by Jsunil Download File 10th Chapter : Electricity Important questions Download File 10th Chapter : Electricity CBSE Guess Questions Download File For more addition visit: 10th Chapter : Electricity
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![]() Control: is the power of restrain and regulation by which something can be started, slowed down, expedited or stopped. Coordination: (L. co-joint, ordinates-regulated) is orderly or harmonious working of different but inter-related parts so as to perform one or more activities very smoothly. Need for control and coordination in an organism: The body of a multicellular organism consists of a number of components and sub-components; each specialized to perform a particular function. However, all the components are not required to function all the time at the same speed. A system of controls is required to function all the time at the same speed. A system of controls is required to allow them to perform or not to perform, slow down or speed up their working. Further, most activities require the simultaneous or sequential functioning of a number of parts, stopping some and stimulation others. During feeding, eyes locate the food, nose registers its smell, hands pick up the food and take it to mouth, mouth opens to receive the food, teeth and muscles take part in its mastication and saliva moistens it. Tongue perceives its taste. It moves the food below the teeth. Later it pushes the crushed food into pharynx. All this is possible only through a system of coordination. CBSE_NCERT Chapter 7 Control and Coordination Biology X Control and Co-ordination Study Notes Download File X Control and Co-ordination Solve Questions Download File 1) Magnetic fields are produced due to
A. Stationary charges B. Moving charges Ö C. Both a and b D. None of the above 2) 1 Gauss = A. 10⁴ Tesla B. 1000 Tesla C. 10⁻⁴ Tesla Ö D. None of the above 3) The magnetic field density along the axial line of a circular coil carrying current A. Zero B. Constant C. Varies with distance from the center of the coil Ö D. None of the above 4) In magneto statics, the magnetic field generated by a steady current is given by A. Biot-Savart’s Ö B. Law Lenz’s Law C. Faraday’s Law D. Ohm’s Law 5) The magnetic field developed at different points on the axial line of a circular coil is A. Directly proportional to the current Ö B. Inversely proportional to the current C. Independent of the current D. Directly proportional to the square of the current 6) What is the nature of the magnetic field inside current carrying loop? A. randomly in all directions B. all in one directionÖ C. all fields cancel each other (no magnetic field) D. none of the above 7) The functioning of an electric motor is based on A. thermal properties of a wire B. magnetic effect of a permanent magnet C. magnetic effects of currentÖ 8) The loops in the conductor repel each other when current is passed through them. A. depends on the type of current B. (AC/DC) depends on the radius of the loops C. true D. falseÖ 9) Which of the following about a magnetic field is correct? A. The unlike magnetic poles repel. B. A magnetic pole can be isolated. C. The magnetic field lines indicate the direction of force.Ö D. A magnetic pole cannot induce magnetic poles in other materials. 10) Amit attaches one end of a string to a steel paper clip and the other end to a table. The string is very light. He then uses a magnet to attract it so the clip seems to float in air. However, when she lifts the magnet, the paper clip falls. What is the reason for this? A. The potential energy of the clip decreases. B. The gravitational force near the magnet increases. C. The magnetic properties of the clip decreases. D. The magnetic field strength near the clip decreasesÖ 11) A rod P is hung on a string and then another rod Q is brought near it. P and Q attract each other. Which of the following statements is correct? A. P must be a magnetic object. B. Q must be a magnetic object. C. Both P and Q must be magnetic objects. D. It is possible that P and Q both are magnetic objects or only one of them is.Ö 12) A piece of metal can be deduced to become a magnet if A. both ends of a compass needle are attracted to it. B. a magnet is attracted to it. C. one end of a compass needle is repelled by it.Ö D. copper wire is repelled by it. 13) Which of the following statements describes an example of induced magnetism? A. A bar magnet, swinging freely, comes to rest pointing North-South. B. A bar magnet loses its magnetism if it is repeatedly dropped. C. A bar magnet attracts a piece of soft iron.Ö D. It is hard to magnetise steel, but easy to magnetise soft iron. 14) A metal bar X-Y hung by a thread always settles in no definite direction. Another bar P-Q of the same metal always comes to rest with end P pointing North. What is the result if the two bars are brought near one another? A. P attracts X but repels Y. B. P neither attracts nor repels X. C. P attracts X but Q repels Y. D. P and Q both attract X.Ö 15) Which of the following is suitable to be used for the needle of a plotting compass? A. Brass B. Copper C. Iron Download this file in pdf : MCQ based on activity Magnetic effect of current Download File 1. If a net charge Q, flows across any cross-section of a conductor in time t, then the current I, through the cross-section is I = Q/t Q = It 2. The electric potential difference between two points in an electric circuit carrying some current is the work done to move a unit charge from one point to the other – Potential difference (V) between two points = Work done/Charge V = W/Q W = VQ 3. Q = n x Charge on 1 electron When a steady current flows through a conductor, the electrons in it move with a certain average ‘drift speed’. 4. If the current I, flowing in a metallic wire and the potential difference across its terminals is V . Then potential difference, V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. This is called Ohm’s law. V a I Þ V = RI or, I = V/R 5. Resistance of the conductor depends (i) on its length, (ii) on its area of cross-section, (iii) on the nature of its material and (iv) temperature R a l/A R = r l/A Or, r = RA/l 6. If resistors joined in series: V = V1 + V2 + V3 but I = I1 = I 2 = I 3 Then R = R 1 + R 2 + R 3 6. If resistors joined in Parallel: V = V1 = V2 = V3 but I = I1 + I 2 + I 3 Then 1/R = 1/R 1 + 1/R 2 + 1/R 3 7. If a current I flowing through a resistor of resistance R. and the potential difference across is V for time t sec Then, the work done in moving the charge Q through a potential difference V is W= VQ. But, Q = It W = V I t ------(i) Now, Power = work done / Time P = W/t {or, W = Pt [The energy supplied to the circuit by the source in time t is P × t = V I t] P = V I t /t [ Using eq. (i) ] P = VI ----------- (ii) The amount of heat produced in time t = H H = the energy supplied to the circuit by the source in time t = V I t Applying Ohm’s law, V = IR H = I2 R t Note: heat produced in a resistor is (i) Directly proportional to the square of current for a given resistance, (ii) Directly proportional to resistance for a given current, and (iii) Directly proportional to the time for which the current flows through the resistor. 8. Electric Power: The rate at which electric energy is dissipated or consumed in an electric circuit is called electric power. The power P is given by P = VI Using, V = IR Þ P = I2R = V2/R Also using, V/R = I Þ P = V2/R 9. The commercial unit of electric energy is kilowatt hour (kW h) = 1 unit. 10. 1 kW h = 1000 watt × 3600 second = 3.6 × 106 watt second = 3.6 × 106 joule (J) Now start practicing these Numerical: Click here To View ![]()
![]() 10th Chapter : Source of Energy Notes and MCQ's Download File 10th Ch: Source of Energy Guess Questions Solved Download File X Phy:Sources of energy Imp. ques with solution Download File X Physics:Chapter : Sources of Energy worksheet Download File 10th Chapter : Source of Energy Notes and MCQ's Download File Related materials Gist Of Lesson : Chapter : Source of Energy Download File 10th assignment : Chapter : Source of Energy Notes Download File 10th Ch: Source of Energy Test Paper with answer Download File Ch: Source of Energy Guess Questions Solved-I Download File Ch: Source of Energy Guess Questions Solved -II Download File Ch: Source of Energy Guess Questions Solved -III Download File |
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