What two factors affect the strength of a magnetic field

Factors Affecting the Strength of the Magnetic Field of an Electromagnet: Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core.

Explanation:

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f=ma newton

f=100x2.5=250n

the answer is a. hope this .