Answer:
A scientist who studies thermodynamics might experiment with the instant ice packs where you have to pop a bag on the inside to create a chemical reaction to make it cold.
Explanation:
Increasing the current intensity through the wire cannot increase the number of turns.
Thus, option B is the incorrect option.
Also, the current in the wire will depend on the power supply and not on the number of turns the wire has. The current in the wire will not change by increasing/decreasing the number of turns.
Thus, option C is the incorrect option.
The strength of the electromagnet depends on the intensity of the current. Thus, the current intensity will determine the electromagnetic strength and electromagnetic strength will not determine the current.
Thus, option D is the incorrect option.
The strength of the electromagnet depends upon the turns of wire around the metal core and the current or voltage passing through the wire. Thus, if we increase the number of turns around the metal core and the current or voltage is also increased, the strength of an electromagnet will also increase.
Thus the correct option is A.
Final Answer:
The correct option is A.
The correct answer is Newtons 2nd law
In 1920, after returning from Army service, he produced a successful model and in 1923 turned it over to the Northeast Electric Company of Rochester for development.