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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 3 · Q31
(a) (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…
(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:
(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 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.