Which one or more of the following choices is (are) true regarding how a magnetic field acts on a charged particle. a magnetic field
1. can increase the speed of a moving particle.
2. can cause a moving particle to accelerate.
3. always exerts a force on a moving particle.
4. can exert a force on a stationary particle.

2. Can cause a moving particle to accelerate.

Explanation: A magnetic field around an object can cause the object to accelerate mainly because of the force exerted on the object by the Magnetic forces. The Operational model of an electric motor is directly based on the impact of Magnetic forces on the electrons moving inside the wire. The CYCLOTRON FREQUENCY is the frequency with which electrons rotate about the direction of a magnetic field as stated in classical physics.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: