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Science · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q37
On the basis of the given circuit arrangement, answer the following questions: (a) What happens to the rod AB when the key K is closed and why? (b)…
On the basis of the given circuit arrangement, answer the following questions :
(a)
What happens to the rod AB when the key K is closed and why ?
(b)
Name and state the rule that determines this behaviour of the rod AB in the above situation.
Marking-scheme solution
The rod AB gets displaced from its original position
Because it experiences a force when placed in external magnetic field
(b)
Fleming's Left Hand Rule
Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If forefinger points in the direction of magnetic field, second finger in the direction of current, then the thumb will point in the direction of motion or force acting on the conductor.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.