CBSE 12th Standard Physics Subject Moving Charges And Magnetism Value Based Questions 5 Mark Questions With Solution 2021
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CBSE 12th Standard Physics Subject Moving Charges And Magnetism Value Based Questions 5 Mark Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Physics
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Two linear parallel conductors carrying currents in the same direction attract each other and two linear parallel conductors carrying in opposite directions repel each other. The force acting per unit length due to currents \({ I }_{ 1 }and{ I }_{ 2 }\)in two linear parallel conductors held distance r apart in vacuum in SI unit is \(F=\frac { { \mu }_{ 0 } }{ 2\pi } \frac { 2{ I }_{ 1 }{ I }_{ 2 } }{ r } \)
Read the above passage and answer the following questions:
(i) What is the basic reason for the force between two linear parallel conductors currents?
(ii) Two straight wires A and B of lengths 2 cm and 20 cm, carrying currents 2.0 A and 5.0 A respectively in opposite directions are lying parallel to each other 4.0 cm apart. The wire A is held near the middle of wire B. What is the force on 20 cm long wire B?
(iii) What does this study imply in day to day life?(a) -
When a galvanometer of resistance G is shunted with a low resistance S, then the effective resistance \({ Re }_{ ff }\)of galvanometer becomes
\( { Re }_{ ff }=\frac { GS }{ G+S } \)
If the current is passed through such a galvanometer, then the major amount of current flows through the shunt and the rest through the galvanometer, then the major amount of current flows through the shunt and the rest through galvanometer., the current divides itself in the inverse ratio of resistances.
Read the above passage and answer the following questions:
(i) Why is the resistance of shunted galvanometer lower than that of a shunt?
(ii) A galvanometer of resistance.\(30\Omega \) What the fraction of the main current passes (i) through the galvanometer and (ii) through the galvanometer and (ii) through the shunt?
(iii) What are the basic values you learn from the above study?(a) -
Saniya and Priya are friends. Both of them know that a small compass needle point always along north-south direction. One day Saniya is plotting field due to a bar magnet in the laboratory. She discovers a point where compass needle does not point along N-S. Rather, it sets itself in any arbitrary direction. Saniya thinks first that compass needle has become faulty. Priya then explains to her the real situation.
Read the above passage and answer the following questions:
(i) How did Priya justify the situation?
(ii) If a bar magnet is placed along the N-S direction with its north pole pointing north, what is the position of neutral points?
(iii) If a bar magnet is placed along N-S direction with its north pole pointing South, What is the position of neutral points?
(iv) What values of life do you learn from this piece of knowledge?(a)
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CBSE 12th Standard Physics Subject Moving Charges And Magnetism Value Based Questions 5 Mark Questions With Solution 2021 Answer Keys
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(i) The force is due to the interaction between magnetic fields due to currents in two linear parallel conductors.
(ii) Here, \({ l }_{ 1 }=2cm=2\times { 10 }^{ -2 }m;{ l }_{ 2 }=20\times { 10 }^{ -2 }m;{ I }_{ 1 }=2.0A;{ I }_{ 2 }=5.0A;r=4\times { 10 }^{ -2 }m\)
Since action and reaction are equal and opposite so the magnitude of repulsive force on 20 cm long wire = the magnitude of repulsive force on 2 cm long wire
= \(\frac { { \mu }_{ 0 } }{ 4\pi } \frac { 2{ I }_{ 1 }{ I }_{ 2 } }{ r } { l }_{ 1 }={ 10 }^{ -7 }\times \frac { 2\times 2\times 5\times (2\times { 10 }^{ -2 }) }{ 4\times { 10 }^{ -2 } }\)
\( ={ 10 }^{ -6 }\)
This study shows that when the current through two parallel conductors flow in the same direction, they attract each other and vice versa. It implies that when the thoughts and actions of two business partners are aligned in the same direction, their behavior is cohesive and they succeed. If there thoughts and actions are opposing, the partnership is likely to collapse. The same thing is true for husband and wife. For a successful family life, the coherence of thoughts and action is a must. -
(i) The shunt is a low resistance connected in parallel with the galvanometer. Therefore, the combined resistance is less than that of the shunt.
(ii) Let I be the total current passing through the shunt galvanometer. Let \({ I }_{ g }\),\({ I }_{ s }\) be the currents through galvanometer of resistances G and shunt of resistance S respectively. As current divides itself in the inverse ratio of the resistances, therefore, fraction of current passing through galvanometer
= \(\frac { { I }_{ g } }{ I } =\frac { S }{ G+S } =\frac { 3 }{ 30+3 } =\frac { 1 }{ 11 }\)
\(Fraction \ of \ current \ passing \ through \ shunt=\frac { { I }_{ s } }{ I } =\frac { G }{ G+S } =\frac { 30 }{ 30+3 } =\frac { 10 }{ 11 } \\ \)
(iii) From the above study, we find that the current always divides itself in the inverse ratio of resistances. The major part of current flows through the shunt, which is the path of low resistance. Similarly in life, if different paths are available to reach a destination, then one selects a path of least resistance to reach there. This would save both, time and energy. -
(i) Priya tells Saniya that while plotting field due to a bar magnet, we obtain the resultant of the magnetic field of magnet and that of earth. At certain points, field due to the magnet becomes equal and opposite to the horizontal component of earth's field. Therefore, net magnetic field due to magnet and due to earth becomes zero at these points.
(ii) When noth pole of bar magnet is pointing north, two neutral pointa are along E-W line passing through centre of magnet.
(iii) When north pole of magnet is pointing south, two neutral points are obtained along the axis of the magnet on opposite sides from the center of the magnet.
(iv) From this piece of knowledge, we learn that staying neutral in a situation is the best. If you are aligned to one group or person, you are forced to go by the dictates of that group, right or wrong. You are not independent. If you are non aligned, you can choose your own course of action without killing your conscience.
