List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed.
Important Questions on Magnetic Effects of Electric Current
Name the poles P,Q,R and S of the magnets in the following figures 'a' and 'b'.
State the inference about the direction of the magnetic field lines on the basis of the diagrams drawn above.
When is the force experienced by a current-carrying straight conductor placed in a uniform magnetic field is maximum?
Name any two devices that use current -carrying conductors and magnetic field.
Draw the pattern of magnetic field lines produced around a current-carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.
A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also reversed.
In the above experimental set up, when current is passed through the rod, it gets displaced towards the left. What will happen to the displacement if the polarity of the magnet and the direction of current both are reversed?
"Magnetic field is a physical quantity that has both direction and magnitude." How can this statement be proved with the help of magnetic field lines of a bar magnet?
