Principle

The strength of the magnetic field of a coil depends, among other things, on the distance between the coils. Expensive clothes or other goods are often electronically secured. These are unlocked at the cash desk with a magnet. There is always a place where the EC card must not be placed, as otherwise the magnetic strip of the EC card can be damaged. Further away, however, it is no problem to put the card down. The magnetic field becomes weaker with greater distance.

Benefits

• Especially understandable and didactically prepared description of the experiment (relevance to everyday life, etc.) including protocol questions.
• Future-oriented teaching: Integration into digital science lessons with tablets or smartphones.
• Increased motivation of students by using the intuitive measureAPP.
• Increased media competence.

Tasks

1. measuring the magnetic flux density of the 26mm Ø coil with a turn of 75 along the longitudinal axis of the coil (z-axis)
2. measuring the magnetic flux density of the 26mm Ø coil with a turn of 300 along the longitudinal axis of the coil (z-axis)

Learning Objectives

In this experiment the magnetic flux density as a function of the distance to the coil through which the current flows and the number of turns is to be investigated.