Bragging rights are not exactly what [Jeremy Fielding] has in mind for his DIY dynamometer ... calculate the power output of a motor: speed and torque. A magnetic tachometer does the job of ...

and so when the motor spins, the stirrer spins in the solution, with no physical contact required. It’s a simple way to build a magnetic stirrer at home without having to shell out big money for ...

To calculate the force on a wire carrying a current at right angles to a magnetic field, use the equation: 2 A flows through a 50 cm wire. Calculate the force acting on the wire when it is placed ...