A student made the electromagnet shown and used it to pick up one sewing pin. She then doubled the number of coils around the nail and used it to pick up two sewing pins. How could she change the electromagnet again in order to pick up three sewing pins?

An electromagnet is the most powerful type of magnet there is. It is a magnet with a current running through it that can be turned on and off. Why might it be useful to be able to turn the electromagnet on and off?

There is a torus whose magnetic field in its mean radius is 150 mT. The smallest radius of the device is known to be 4 cm and the largest radius is 6 cm. Considering that it has 2,500 turns per layer and is made up of 5 of them, determine the current that circulates in said torus. A) 3 A B) 15 A C) 2.39 A D) 3.6 A

Consider an electron moving down in a uniform magnetic field as depicted below. How will its trajectory get altered? Particle moving down in B directed in B Bend to the right Bend to the left Continue unchanged Bend inwards Bend outwards

An example of magnetohydrodynamics (MHD) comes from the flow of a river (salty water). This fluid interacts with the Earth’s magnetic field to produce a potential difference between the two river banks. How would you go about calculating the potential difference?

A current-carrying circular loop in a uniform magnetic field is placed in four different orientations as shown in Figures A, B, C and D. Which figure depicts a stable equilibrium configuration? B O O O Πo A B C D A. A B. C C. D D. B

A magnet can exert a force on a moving charged particle, but it cannot change the particle’s kinetic energy. Why not?

Does the magnetic field change faster or slower when the magnet is inserted into or pulled out from the coil of wire continuously? Please provide an explanation.

A 10 m long solenoid contains 284 turns of wire and can generate a magnetic field of 0.01 T from a current of 2.8 A. If the solenoid is broken in half, the field would be expected to... A )Stay the same B Double C)Quarter D) Halve

Three charged particles move in a magnetic field as shown. All the particles have the same mass and the same magnitude of charge. Which particle is moving the fastest? Which particles have positive charges, and which have negative charges?