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Science · 2026 · 5 marks
CBSE 2026 · Region 2 · Set 2 · Q39
(i)State the rules to determine the following :(I)Direction of magnetic field produced around a current-carrying straight conductor.(II)Direction of force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.(ii)(I)Draw the magnetic field lines due to a current-carrying solenoid.(II)
Three points A, B and C are marked in the above given diagram of the current-carrying solenoid. Out of the three points A, B and C, at which point is the magnetic field strength maximum and at which point is it minimum ?(i)(I)In the given circuit diagram, a battery $\displaystyle B$, a key $\displaystyle K$, a resistance $\displaystyle R$ and a thick copper wire XY are connected in series and a compass is placed near the wire. What is the purpose of this arrangement ?(II)What conclusion do you draw from it ?
(ii)Give reasons :(I)There is either a convergence or a divergence of magnetic field lines near the ends of a current-carrying straight solenoid.(II)The current-carrying solenoid, when suspended freely, aligns along a particular direction.(III)The burnt-out fuse should be replaced by another fuse of identical rating.
(i)
State the rules to determine the following :
(I)
Direction of magnetic field produced around a current-carrying straight conductor.
(II)
Direction of force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
(ii)
(I)
Draw the magnetic field lines due to a current-carrying solenoid.
(II)
Three points A, B and C are marked in the above given diagram of the current-carrying solenoid. Out of the three points A, B and C, at which point is the magnetic field strength maximum and at which point is it minimum ?
(i)
(I)
In the given circuit diagram, a battery $\displaystyle B$, a key $\displaystyle K$, a resistance $\displaystyle R$ and a thick copper wire XY are connected in series and a compass is placed near the wire. What is the purpose of this arrangement ?
(II)
What conclusion do you draw from it ?
(ii)
Give reasons :
(I)
There is either a convergence or a divergence of magnetic field lines near the ends of a current-carrying straight solenoid.
(II)
The current-carrying solenoid, when suspended freely, aligns along a particular direction.
(III)
The burnt-out fuse should be replaced by another fuse of identical rating.
Marking-scheme solution
(a) (i)
(I) Imagine that you are holding a current carrying straight conductor in your right hand such that the thumb points towards the direction of current. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
(II) Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If the first finger (forefinger) points in the direction of the magnetic field and the middle finger (second finger) in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor.
(ii) (I)
Diagram Direction of current and magnetic field
Diagram Direction of current and magnetic field(II) Maximum- At point A Minimum- At point B
OR
(North pole) showing divergence and merge at the other end (South pole) showing convergence.(II) The current carrying solenoid behaves like a bar magnet which aligns itself along a particular direction (N-S) due to earth's magnetic field.
(III) If a fuse of higher rating is used, it will not be able to prevent the damage due to overloading. / If a fuse of lower rating is used, it will melt and break the circuit.
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.