6 Which of the following graphs best represents the obeys Ofhm\'s law? 7. Which
ID: 2248898 • Letter: 6
Question
6 Which of the following graphs best represents the obeys Ofhm's law? 7. Which of the following states Ohm's Law? B. I VR E.R-VI . "The sum of the currents into a junction equals the sum of the currents out of the junction" is A. Newton's third law B. Ohm's law C. Newton's second law D. conservation of energy E. conservation of charge The sum of the voltages dropped plus the voltages gained around a closed loop equals ze a consequence of A. Newton's third law B. Ohm's law C. Newton's second law D. conservation of energy E. conservation of chargeExplanation / Answer
6.Graph B best represents the current voltage realtionship of device ehich obey's Ohm's law as it is the only graph which is linear (straight line passing through the origin). Ohm's law states that the relationship between voltage and current is always linear. Other graphs do not have linearity as Graph A and Graph C do not have straight lines (though they pass through the origin),Graph E is a straight line but it does not pass through the origin and Graph D neither has straight line nor it passes through the origin. Remember a relationship (graph) is linear only if it satisfies both the condition: it is a straight line and it passes though the origin. A device obeying Ohm's law must ALWAYS HAVE A LINEAR GRAPH.
7.Option C.V=IR, This is the very definition of Ohm's law; the voltage across an element obeying Ohm's law is directly proportional to the current through it and R here is the constant of proportionality resistance.
8.Option E.conservation of charge. The sum of currents into a junction is equal to the sum of currents out of the junction (this is called Kirchoff's current law (KCL)) follows from the fact when currents are steady there is no accumulation of charges at any point and the charge is conserved (that is charges can neither be created nor be destroyed). Since the charge is conserved there is no creation of charges but only their movement.
9.Option D.conservation of energy. This follows from the fact that when a loop is traversed from a point back to the same point the potential is same. Therefore any rise in potential along the loop must be countered by an equal drop in potential. Hence the energy remains conserved
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