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Science · 2025 · 3 marks
CBSE 2025 · Region 3 · Set 1 · Q32
Consider a rectangular cardboard having two holes P and Q through which a current carrying circular loop has been inserted as shown in the diagram.…
Consider a rectangular cardboard having two holes P and Q through which a current carrying circular loop has been inserted as shown in the diagram.
(a)
Make this diagram on your answer sheet and draw three magnetic field lines, one each passing through the points $\displaystyle 1$ (near P), $\displaystyle 2$ (at the centre of the loop) and $\displaystyle 3$ (near Q).
(b)
List two factors on which the intensity of the magnetic field produced at the centre of the loop depends.
(c)
Name the rule you will apply to determine the direction of magnetic field produced due to a current carrying straight conductor.
Marking-scheme solution
(a) 
Marking magnetic lines for points $\displaystyle 1,2$ and $\displaystyle 3$ (b)
Marking magnetic lines for points $\displaystyle 1,2$ and $\displaystyle 3$ (b)Strength of the current in the loop
No. of turns of loop
(c) Right hand thumb rule
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.