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Science · 2026 · 5 marks
CBSE 2026 · Region 3 · Set 1 · Q39
Attempt either (a) or (b) :(i)What is a solenoid ? Draw a diagram showing the magnetic field pattern due to a current-carrying solenoid (inside and outside).(ii)Name any two factors on which the magnitude of the magnetic field due to a current-carrying solenoid depends.(iii)A current-carrying solenoid is stretched and converted into a straight wire carrying current. Draw a diagram showing the magnetic field pattern around it and mark the direction of the magnetic field.(i)With the help of a diagram, show that a current-carrying conductor placed in an external magnetic field, experiences a force. Indicate the direction of the field, current and force clearly.(ii)The diagram given below shows an electron moving in a uniform magnetic field.
(I)What will be the direction of the force acting on the electron?(II)What will happen to the direction of the force acting on the electron, if the direction of the magnetic field as well as the direction of motion of the electron, both are reversed?
Attempt either (a) or (b) :
(i)
What is a solenoid ? Draw a diagram showing the magnetic field pattern due to a current-carrying solenoid (inside and outside).
(ii)
Name any two factors on which the magnitude of the magnetic field due to a current-carrying solenoid depends.
(iii)
A current-carrying solenoid is stretched and converted into a straight wire carrying current. Draw a diagram showing the magnetic field pattern around it and mark the direction of the magnetic field.
(i)
With the help of a diagram, show that a current-carrying conductor placed in an external magnetic field, experiences a force. Indicate the direction of the field, current and force clearly.
(ii)
The diagram given below shows an electron moving in a uniform magnetic field.
(I)
What will be the direction of the force acting on the electron?
(II)
What will happen to the direction of the force acting on the electron, if the direction of the magnetic field as well as the direction of motion of the electron, both are reversed?
Marking-scheme solution
(i) Solenoid - A coil of many circular turns of insulated copper wire, wrapped closely in the shape of cylinder.
Current flowing through the solenoid
No. of turns of the coil
(iii)
(b) (i) When current is passed through the conductor, it experiences a force and gets displaced.
diagram direction of current direction of magnetic field direction of force
(ii)
(I)
Into the plane of paper
(II)
The direction of force will remain same.
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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.