(a) In the diagram given below, Coil - 1 is connected in series with a battery and a plug key while Coil - 2 is connected with a galvanometer.
(i) Why does the galvanometer show deflection only when the key (K) is plugged in and not when a steady current starts flowing in the circuit?
(ii) What is observed in the galvanometer, when the key is plugged out?
(iii) State the conclusion based on the observation of this activity.
(a) In the diagram given below, Coil - 1 is connected in series with a battery and a plug key while Coil - 2 is connected with a galvanometer.
(i) Why does the galvanometer show deflection only when the key (K) is plugged in and not when a steady current starts flowing in the circuit?
(ii) What is observed in the galvanometer, when the key is plugged out?
(iii) State the conclusion based on the observation of this activity.
(i) The arm AB will experience a force in the downward direction and the arm CD will experience a force in the upward direction.
(ii) The part of the electric motor that reverses the flow of current in the coil ABCD is the commutator.
(iii) After the reversal of flow of current in the coil ABCD, the arm AB will experience a force in the upward direction and the arm CD will experience a force in the downward direction.
(iv) The rule applied to determine the direction of force on a current-carrying conductor placed in a magnetic field is the Fleming's left-hand rule.
Marking Scheme
- 1(i) 1 mark
- 2(ii) 1 mark
- 3(iii) 1 mark
- 4(iv) 1 mark
Hint
Use the Fleming's left-hand rule to determine the direction of force on a current-carrying conductor placed in a magnetic field.
Quick Oral Answer
The Fleming's left-hand rule is a useful tool for determining the direction of force on a current-carrying conductor placed in a magnetic field. By applying this rule, we can easily determine the directions of the forces on the arms AB and CD in the given situation.
Analysis & Explanation
The Fleming's left-hand rule is a useful tool for determining the direction of force on a current-carrying conductor placed in a magnetic field. By applying this rule, we can easily determine the directions of the forces on the arms AB and CD in the given situation.
Common Mistakes
- 1Applying the right-hand rule instead of the left-hand rule
- 2Not considering the reversal of current flow in the coil
Interesting Facts
The Fleming's left-hand rule is named after the British engineer and physicist John Ambrose Fleming.
The rule is widely used in electrical engineering and physics to determine the direction of force on a current-carrying conductor placed in a magnetic field.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2022?
This question carries 3 marks in the CBSE Class 10 Science 2022 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Magnetic Effects of Electric Current" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Electric Motor" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2022 paper?
This is a Short Answer question from Section SECTION B in the CBSE Class 10 Science 2022 paper.