Statethe characteristics of the magnetic field produced by a current- carryign solenoidsketic itsmagnetic field .

Statethe characteristics of the magnetic field produced by a current-

1.	Statethe characteristics of the magnetic field produced by a current- carryign solenoidsketic itsmagnetic field .
Answer» Solution :A helical coil consitingof closely woundturns of insulated copper(conducting ) wireiscalled a solenoid . Whenan electric currentis passed through the solenoid , it produces a magnetic fieldthrough and AROUND it . Thepatter of magneticfieldlines of themagneticfieldthroughand arounda currentcarryingsolenoid is SHOWN in figure 13.14 Themagneticfieldproduced by a currnetcarryingsolenoid similarto thatproduced by a bar magnet. (1) Directlyproportional to the currentI flowingthrough it , i.e., `B prop I` (2) Directly PROPORTIONALTO the numberof turnsper unitlength n of the solenoid i.e., `B prop n` or `B prop (N)/(l)` , where , N = totalno . of TURNS of the solenoidandl = length of the solenoid . (3) Dependentof the nature of the" corematerial "used in makingthe solenoid . ( Useof SOFT iron rod as core in a solenoidincrease the strength of magneticfield ).