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The magnetic field strength of an electromagnet is therefore determined by the ampere turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field.
â¢ Derive an expression for the electric potential and electric field. â¢ Calculate electric field strength given distance and voltage. 19.3.Electrical Potential Due to a Point Charge. â¢ Explain point charges and express the equation for electric potential of a point charge. â¢ Distinguish between electric potential and electric field. â¢ Determine the electric potential of a point charge given charge and distance.