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Science · 2025 · 5 marks
Magnetic Effects of Electric CurrentMagnetic Field due to a Current-carrying Conductor5 marksApplylong answer
CBSE 2025 · Region 4 · Set 1 · Q36
(A) (i) Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite…
(i)
Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)
(ii)
In our houses we receive A.C. electric power of $\displaystyle 220$ V. In electric iron or electric heater cables having three wires with insulation of three different colours - red, black and green are used to draw current from the mains.
(a)
What are these three different wires called? Name them colourwise.
(b)
What is the potential difference between the red wire and the black wire?
(c)
What is the role of the wire with green insulation in case of accidental leakage of electric current to the metallic body of an electrical appliance?
(i)
By using the given experimental set-up. How can it be shown that :
(a)
a force is exerted on the current-carrying conductor AB when it is placed in a magnetic field.
(b)
the direction of force can be reversed in two ways.
(ii)
When will the magnitude of the force be highest?
(iii)
State Fleming's left hand rule.
Marking-scheme solution
(A)(i)
(ii)(a)
red wire : Live wire black wire : Neutral wire green wire : Earth wire
(b)
$\displaystyle 220$ V the earth and the user may not get a severe electric shock.
(B)
(i)(a)
The conductor AB gets displaced.
(b)
By reversing the direction of the current.
By reversing the direction of the magnetic field. magnetic field.
(iii)
Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of the force acting on the conductor.
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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.