**Shape of the Day**

- Attendance: random seats
- Astrophysicist gets magnets stuck up nose while inventing coronavirus device
- Return in-class momentum assignment
- Will return rest of assignments over the week
- Go over homework – Worksheet – Electromagnetism
- Electromagnet activity in groups of 3
- Measure N and L for your electromagnet
- Measure the resistance of the wire
- Calculate the strength of the magnetic field, if the current is 2.5 A
- Calculate the power used, if the current is 2.5 A
- P = I²R (twinkle, twinkle, little star, power equals I squared R)

- Calculate the length of wire used
- Calculate the volume of copper used in the wire
- Calculate the cost of the copper used ($4.6 per kg, 8.96 g/cm³)
- Calculate the volume of iron used in the core
- Calculate the cost of the iron used ($1.67 per kg, 7.874 g/cm³)
- Calculate the cost of building your electromagnet (iron and copper) per Tesla generated

- Wrap-up