Q12 of 238 Page 82

Describe how you will locate a current-carrying wire concealed in a wall.

To locate a current carrying wire concealed in a wall one should use a plotting compass. by moving plotting compass on the wall the deflection in its needle shows the place where wire is concealed in the wall.


More from this chapter

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10

State three ways in which the strength of an electromagnet can be increased.

 11

Fill in the following blanks with suitable words:

(a) The lines of _____ round a straight-carrying conductor are in the shape of _____


(b) For a current-carrying solenoid, the magnetic field is like that of a _____


(d) The magnetic effect of a coil can be increased by increasing the number of _____, increasing the _____ or inserting an _____ core.


(e) If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a _____ pole.


(f) If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a _____ pole.

 13

Describe some experiment to show that the magnetic field is associated with an electric current.

 14

Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.