Magnetism16119.47The magnetic field inside a long solenoid is 00NILµµ==Bn. Thus, the required current is I( )( )()42-701.0010T0.400 m3.1810A31.8 mA410T m A1000BLINµπ−−×=×=×⋅19.48(a) From RLAρ=, the required length of wire to be used is 2385.00 0.50010m457.7 m1.7010mRAL−−Ω×⋅=×Ω⋅The total number of turns on the solenoid (that is, the number of times this length of wire will go around a 1.00 cm radius cylinder) is 257.7 m919221.0010mLNr−=×(b) From B0nI=, the number of turns per unit length on the solenoid is 23-704.0010T7.9610 turns m410TmA4.00ABnI−×Thus, the required length of the solenoid is
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