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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 1 · Q32
(i)State the rule used to find the force acting on a current carrying conductor placed in a magnetic field.(ii)Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be(1)maximum and ($\displaystyle 2$) minimum respectively. Give reason for your answer.
(i)Draw the pattern of magnetic field lines of(1)a current carrying solenoid(2)a bar magnet(ii)List two distinguishing features between the two fields.
(i)
State the rule used to find the force acting on a current carrying conductor placed in a magnetic field.
(ii)
Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be
(1)
maximum and ($\displaystyle 2$) minimum respectively. Give reason for your answer.
(i)
Draw the pattern of magnetic field lines of
(1)
a current carrying solenoid
(2)
a bar magnet
(ii)
List two distinguishing features between the two fields.
Marking-scheme solution
(a) (i) Flemings left-hand rule: Stretch the forefinger, the central finger and the thumb of your left hand in mutually perpendicular directions. If the forefinger shows the direction of the magnetic field and the central finger that of the current, then the thumb will point towards the direction of motion of the conductor or direction of force /
(ii) ($\displaystyle 1$) Force on electron is maximum in Fig (i) because the direction of motion of electron/current is at right angle/perpendicular to that of magnetic field.
(2) Force on electron is minimum in Fig (iii) because the electron is moving along / parallel to the direction of magnetic field
(i)
(1)
Magnetic field lines of a current carrying solenoid
(2) 
Magnetic field lines of a bar magnet
Magnetic field lines of a bar magnet(ii)
| Magnetic field of a solenoid | Magnetic field of a bar magnet |
| 1. The strength of the magnetic field can be changed by changing the current. | 1. The strength of the magnetic field for a bar magnet cannot be changed. |
| 2. The direction of magnetic field can be reversed by reversing the direction of current. | 2. The direction of magnetic field for a bar magnet cannot be changed. |
| 3. It is a temporary magnetic field. | $\displaystyle 3$ It is a permanent magnetic field. |
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.