Physics, 01.08.2019 02:20, xlansmooth
An insulated wire of diameter 1.0 mm and negligible resistance is wrapped tightly around a cylindrical core of radius 5.0 cm and length 30 cm to build a solenoid. what is the energy stored in this solenoid when a current i = 0.20 a flows through it? (μ0 = 4π × 10-7 t ∙ m/a)
Answers: 1
= Total number of turns 
= diameter of insulated wire = 1 mm = 0.001 m 
= length of the cylindrical core = 30 cm = 0.30 m 
= radius of the core = 5 cm = 0.05 m 
= πr²
= 0.00296 
= current in the solenoid = 0.20 A 
= 5.92 x 10⁻⁵ J 
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