PHYS 2211 Chapter Episode 11 and 12: Episode 11 and 12 / Gravity, Electricity, Magnetism, The Millikan Experiment / Cal-Tech: The Mechanical Universe
Document Summary
Episode 11 and 12 / gravity, electricity, magnetism, the millikan experiment / Many physicists have strived to calculate universal constants. Michelson succeeded in accurately measuring the speed of light between two mountain peaks. Cavendish discovered the gravitational constant be essentially weighting the earth. Gravity, magnetism, and electricity are subtly different; gravity is always an attractive force while magnetism and electric can be either attractive or repulsive. In magnetism and electricity like charges repel while opposite charges note the similarities. Physicist realized that electricity and magnetism where related. In a famous experiment a wire with electric current passing through it was able to displace a compass needle. attract. But in magnetism there is always an equal and opposite pole for every charge. The formulas for the three are as follows: (cid:1832)= (cid:3117)(cid:3118)(cid:3045)(cid:3118) (cid:1832)=(cid:3044)(cid:3117)(cid:3044)(cid:3118)(cid:3045)(cid:3118) (cid:1832)=(cid:3043)(cid:3117)(cid:3043)(cid:3118)(cid:3045)(cid:3118) , Cavendish"s gravitational constant, (cid:1833)=(cid:888). (cid:889)(cid:883)(cid:882) 11(cid:3118)(cid:3118) was measured by calculating the attractive force between two objects of known weight.