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iron Bars form a solenoid when wrapped in a coil by a current carrying copper conducting wire .

copper coils generate a magnetic field when a current is passed through the coil . according to the helmholtz law.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.