Theresa has a magnet and two coils of tightly bound copper wire.     How could Theresa cause an electric current to flow through one of the copper wires?

Electric motors convert electrical energy to mechanical energy. When a current-carrying coil is placed between the magnetic poles, a force acts on it that causes it to rotate. The image below shows a simple electric motor.     What can be done to make the coil rotate faster?

A generator converts mechanical energy to electrical energy. When a coil placed between two magnets rotates, the magnetic lines of force are disturbed. This induces a current in the coil. The image below shows a generator.     What could be done to make the lamp brighter?

In science class, students used straws, tape, and two small black containers filled with clay to build an electroscope. An electroscope is a device that detects an electrical charge. The image below shows how the tape on the student's electroscope detects charge.     to charge the tape, the students stuck each piece to a surface and then quickly pulled it off. this action caused each piece of tape to gain or lose charged particles and become positively or negatively charged.   how will the electroscope's tape move if each piece has a negative charge?

In science class, students built the device pictured below using cardboard, wires, pipes, compasses, and a battery.     When there is no electricity running through the wire, all the compass needles point toward Earth's magnetic north pole. When electric current is flowing through the wire, the compass needles change direction and point around the wire in a circle.   As part of their investigation, the students moved each compass farther from the wire and wrote down their observations. What were the students most likely testing in this part of the investigation?

Jen is conducting an experiment involving a device known as a pith-ball electroscope, shown below.     the plastic ball of the electroscope hangs in midair and is uncharged. charges cannot move along the silk thread that holds the ball in the air.   jen completes the following steps in her experiment: 1. she collects three identical, uncharged rubber tubes. 2. she holds a magnet to the first tube for 5 minutes. 3. she submerges the second tube in a tank of water for 5 minutes. 4. she rubs the third tube with animal fur for 5 minutes. jen's teacher tells her that she can use the pith-ball electroscope to see if any of the rubber tubes are surrounded by an electric field. What should Jen do to test for an electric field surrounding each tube?

Brutus builds the simple electric generator pictured below. An electric current is generated in the wire loop whenever he turns the crank, causing the magnet to spin.     How could Brutus increase the amount of electric current his generator produces?