Write four properties of magnetic lines of force.
Important Questions on Magnetic Effects of Electric Current
A student performs an experiment to study the magnetic effects of current around a current-carrying straight conductor with the help of a magnetic compass. He reports that:
(i) The degree of deflection of the magnetic compass increases when the compass is moved away from the conductor.
(ii) The degree of deflection of the magnetic compass increases when the current through the conductor is increased.
Which of the above observations of the student appears to be wrong and why?
In the figure below, identify the poles marked and as north pole or south pole. Give reason for your answer.
(a) Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another.
(b) List any two properties of magnetic field lines.
What happens to the deflection of the compass needle placed at a point near current-carrying straight conductor
(a) If the current is increased,
(b) If the direction of current in the conductor is changed,
(c) If compass is moved away from the conductor?
A student performs an experiment to study the magnetic effect of current around a current-carrying straight conductor. He reports that
(a) For a given battery, the degree of deflection on N-pole decreases when the compass is kept at a point farther away from the conductor.
(b) The direction of deflection on N-pole of compass needle kept at a given point near the conductor remains unaffected even when the terminals of the same battery sending current in the wire are interchanged. Which of the two observations appears to be wrong and why?
