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Science · 2022 · 2 marks
CBSE 2022 · Region 4 · Set 1 · Q2
As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe magent in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key.
State giving reason :(a)What is observed when a current is passed through the aluminum rod from end B to end A ?(b)What change is observed in a situation in which the axis of the rod 'AB' is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction ?OR "Magnetic field is a physical quantity that has both direction and magnitude." How can this statement be proved with the help of magnetic field lines of a bar magnet?
As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe magent in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key.
State giving reason :
(a)
What is observed when a current is passed through the aluminum rod from end B to end A ?
(b)
What change is observed in a situation in which the axis of the rod 'AB' is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction ?
OR "Magnetic field is a physical quantity that has both direction and magnitude." How can this statement be proved with the help of magnetic field lines of a bar magnet?
Marking-scheme solution
(a)
Rod AB would get displaced
Reason: When a current carrying conductor is placed in an external magnetic field perpendicularly, it experiences a force.
(b) As current and magnetic field are parallel, there will be no force experienced by the conductor hence no displacement in rod.
OR
Field lines emerge from the north pole and merge at south pole/the direction in which a north pole of the compass needle moves inside it.
The relative strength of the magnetic field is shown by the degree of closeness of the field lines. Crowded are the field lines, stronger is the field.
OR diagrammatic expression.
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.