a] What is a solenoid ?Draw the patterns of magnetic field lines of a solenoid through which a steady currentflows. What does the pattern of field lines the solenoid indicate?b] Write one use of a solenoid .

a] What is a solenoid ?Draw the patterns of magnetic field lines of a

1.	a] What is a solenoid ?Draw the patterns of magnetic field lines of a solenoid through which a steady currentflows. What does the pattern of field lines the solenoid indicate?b] Write one use of a solenoid .
Answer» Solution :a] A coil of insulated copper wire woundin the form of a CYLINDER is a solenoid. Whencurrent is passed through a solenoid, it produces MAGNETIC fieldlines like a bar magnet. The pattern of magnetic field linesof a solenoid is shown in the figure. Inside the solenoid, field lines are parallel to each other This indicatesthat the magnetic fieldis UNIFORM . b] Solenoids are USED in hotel door-locks, are CONDITIONERS, storage hard-disks, speakers, microphones, power plants, cars, etc.