# Tagged With "Magnetic field"

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#### The Inverse Cube Law for a Neodymium Dipole Magnet

PocketLab makes is quite easy to investigate and verify the inverse cube law for the magnetic field of a neodymium magnet as a function of distance from the magnet. All that is needed in addition to The PocketLab is a centimeter ruler, small neodymium magnet, a small block of wood and a little double stick tape. The photo below shows how the neodymium magnet is taped to the block of wood with the magnet located at the 10 cm mark on the NSTA ruler. The height of the center of the magnet is at...

Blog Post

#### Magnetic Field on the Axis of a Current Loop

In this lesson students will find that a current-carrying loop can be regarded as a magnetic dipole, as it generates a magnetic field for points on its axis. The figure below shows a diagram and the equation for the magnetic field B. Derivation of this equation requries knowledge of the Biot-Savart Law, calculus and trigonometry. But in this lesson we are interested only in comparing experimental results from PocketLab's magnetometer to the theoretical equation in the figure below. More...

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#### PocketLab Joins Ozobot to Study Position, Velocity and Acceleration Concepts

Ozobot ( ozobot.com ) is a tiny one inch diameter line-traveling robot that can be used in conjunction with PocketLab to easily study the physics concepts of position, velocity, and acceleration and their time graphs. PocketLab is simply taped to the top of an Ozobot using double-sided mounting tape. In other words, Ozobot gives Pocket lab a ride. The photo below shows this setup, with Ozobot following a 1/4" heavy black line drawn with a chisel tip marking pen. A magnetic ruler can be...

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#### Investigating Ampere's Law for a Long Current Carrying Wire

One of the classes of problems dealing with magnetic fields concerns the production of a magnetic field by a current-carrying conductor or by moving charges. It was Oersted who discovered back in the early 1800's that currents produce magnetic effects. The quantitative relationship between the magnetic field strength and the current was later embodied in Ampere's Law, an extension of which made by Maxwell is one of the four basic equations of electromagnetism. PocketLab, used in conjunction...