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Answer 1

3. Answer-A coil of wire usually in cylindrical form that when carrying a current acts like a magnet so that a movable core is drawn into the coil when a current flows and that is used especially as a switch or control for a mechanical device (such as a valve)

4. Answer-You can determine the polarity of a solenoid by using Clock Rule. Look at the face of loop, if the current around that face is in anticlockwise direction, the face has the north polarity while if the current at that fave is in clockwise direction, the face has the South polarity.

5. Answer-Factors Affecting the Strength of the Magnetic Field of an Electromagnet: Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core.