Magnetic Effects of Electric Current
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Magnetic Effects of Electric Current
English 6 leveled MCQs Free
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9 marks Long answer
A student passes electric current through a circular wire loop and places a cardboard sheet perpendicular to the plane of the loop. On sprinkling iron filings over the cardboard, the student observes a definite pattern of magnetic field lines. (a) Draw the magnetic field pattern around the current-carrying circular loop. (b) Explain the nature of the magnetic field at the center of the loop. (c) State how the magnetic field strength at the center of the loop changes when the current through it is increased.
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The field lines are concentric circles; the field is uniform at the center; increasing current strengthens the magnetic field.
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3 marks Medium answer
A student places a sheet of cardboard over a bar magnet and sprinkles iron filings on it. The filings arrange themselves in a definite pattern around the magnet. Based on this observation, draw the pattern of field lines and write any two properties of magnetic field lines.
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Field lines emerge from the north pole and enter the south pole; they do not intersect.
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3 marks Medium answer
An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
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The oven exceeds the current rating, which may cause a circuit overload.
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1 marks Short answer
At which point is the magnetic field strongest around a straight conductor?
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Near the conductor
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1 marks Short answer
In the given figure, the electron enters into the magnetic field. It deflects towards
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positive y-direction
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1 marks Short answer
Assertion (A): Solenoid produces stronger magnetic field than straight wire. Reason (R): Magnetic fields due to each turn add together.
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Both A and R are true and R is the correct explanation of A
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