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Electromagnetism, Magnetic Effects of Electric Current, Electromagnetic Induction — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsElectromagnetism, Magnetic Effects of Electric Current, Electromagnetic Induction5 Marks
Question
(i) The diagram given shows a rectangular coil ABCD , suspended freely between the concave pole pieces of a permanent horse-shoe magnet, such N that the plane of coil is parallel to magnetic field.
(a) State your observation when the current is switched on.
(b) Give an explanation for your observation in (a)-
(c) State the rule which will help you to find the motion of rotation of the coil.
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(ii) State four ways of increasing the magnitude of the force acting on the coil.
(iii) Draw a diagram showing the magnetic field around solenoid when electric current flows through it.
✓

Answer

(i) (a) The coil ABCD will turn about its axis. The arm $A B$ of the coil will move out of the plane of the paper and arm CD into the plane of the paper. Thus, coil will tum in the anti-clockwise direction.
(b) A magnetic field is set up by this coil due to the passage of electric current, which is at right angles to the magnetic field of permanent magnet. Thus, a magnetic couple acts, which turns the coil.
(c) Fleming's Left Hand Rule : It tells the direction of motion of conductor carrying current in a magnetic field. It states :
Stretch the thumb, the forelinger and the middle finger of left hand at right angles with each other, such that forefinger points in the direction of the magnetic field, middle finger points in the direction of the current. Then, the thumb points in the direction of the motion of the conductor.
(ii) We can increase the magnitude of the force acting on the coil
(a) By increasing the number of turns in the coil.
(b) By increasing the area of cross-section of the coil.
(c) By placing a laminated soft iron core within the coil
(d) By increasing the magnitude of current in the coil.
(iii)
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