Factors which determine the amplitude of the voltage induced in a conductor which is cutting magnetic lines of force:
• Faraday’s law of electromagnetic induction and what affects induced EMF • Relationship between magnetic flux density, motion (speed), and angle relative to the field • How multiple contributing factors are treated when choosing among answer options
• Think about the basic formula for induced voltage in a straight conductor moving through a magnetic field. Which physical quantities appear in that relationship? • If the conductor moves faster through the field, what happens to the induced voltage? If the magnetic field is stronger, what happens? • How does the angle between the conductor’s motion and the magnetic field lines change the effective cutting of lines of force?
• Identify all the variables that can change the magnitude (not direction) of the induced voltage in a moving conductor • Check whether each individual option (A, B, C) correctly names one of those variables • Ask yourself: if more than one option is clearly a correct factor, what does that imply about choice D?
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