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Science · 2026 · 5 marks
CBSE 2026 · Region 3 · Set 2 · Q39
Attempt either (a) or (b) :(i)Write the name and statement of the rule used to determine the direction of the :(I)force experienced by a straight current-carrying conductor placed in a uniform magnetic field perpendicular to the field.(II)magnetic field produced around a straight conductor carrying electric current.(ii)Differentiate between the magnetic field due to a bar magnet and the magnetic field due to a current-carrying solenoid.(i)With the help of a diagram, describe an activity in brief to show that a current-carrying straight conductor produces a magnetic field around it.(ii)Two straight current-carrying conductors (A) and (B) are shown in the figures below :
(A)(B)(I)Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B).(II)Compare the strengths of magnetic fields produced(1)at points P and Q and ($\displaystyle 2$) at points Q and R due to these current-carrying conductors, qualitatively.
Attempt either (a) or (b) :
(i)
Write the name and statement of the rule used to determine the direction of the :
(I)
force experienced by a straight current-carrying conductor placed in a uniform magnetic field perpendicular to the field.
(II)
magnetic field produced around a straight conductor carrying electric current.
(ii)
Differentiate between the magnetic field due to a bar magnet and the magnetic field due to a current-carrying solenoid.
(i)
With the help of a diagram, describe an activity in brief to show that a current-carrying straight conductor produces a magnetic field around it.
(ii)
Two straight current-carrying conductors (A) and (B) are shown in the figures below :
(A)
(B)(I)
Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B).
(II)
Compare the strengths of magnetic fields produced
(1)
at points P and Q and ($\displaystyle 2$) at points Q and R due to these current-carrying conductors, qualitatively.
Marking-scheme solution
(a) (i) (I)
Fleming's left hand rule.
Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and second finger in the direction of current then thumb will point the direction of force acting on the conductor.
(II)
Right hand thumb rule.
Imagine that you are holding a current carrying conductor in your right hand such that thumb points towards the direction of current. Then your fingers will wrap around the conductor in the direction of field lines of magnetic field.
(ii)
When current passes through a straight conductor, the compass needle placed near it shows deflection.
| Magnetic field due to bar magnet | Magnetic field due to currentcarrying solenoid |
| Strength of magnetic field is constant. | Strength of magnetic field can be changed by changing the magnitude of current. |
| Direction of magnetic field cannot be changed without changing the orientation of magnet. | Direction of magnetic field can be changed by changing the direction of current. |
OR
(b)(i)
When current passes through a straight conductor, the compass needle placed near it shows deflection.More from Magnetic Effects of Electric Current
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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.