Study the given diagram.
When a small magnetic needle is placed below a horizontal conductor carrying a strong current from west to east, its north pole will point in the direction of:
Important Questions on Magnetic Effects of Electric Current
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.
The magnetic field around a current carrying conductor AB is given in the figure. Based on Maxwell's right-hand screw rule, find the direction of the current through the conductor.
The diagram below shows a magnetic needle kept just below the conductor AB which is kept in the North-South direction.
i) In which direction will the needle deflect when the key is closed?
ii) Why is the deflection produced?
iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?
iv) Name one device which works on this principle.
(a) State the rule to determine the direction of
(i) magnetic field produced around a straight conductor carrying current.
(ii) force experienced by current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
(iii) current induced in a coil due to its rotation in a magnetic field.
(b) What is the function of an earth wire? Why is it necessary to earth metallic appliances?
