Electromagnetism and Wires

The direction of the magnetic field at point R caused by the current I in the wire shown above is

• to the left

• to the right

• toward the wire

• into the page

• out of the page

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A particle of charge and mass m moves toward a long wire that carries a current I. At the instant shown above, the particle is a distance r from the wire and is moving perpendicularly toward the wire with speed v . There is a magnetic force on the particle as a result of the current. What is the direction of the magnetic force on the particle at the instant shown?

• Toward the wire

• Toward the left

• Toward the right

• Out of the plane of the page

• Into the plane of the page

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A particle of charge and mass m moves toward a long wire that carries a current I. At the instant shown above, the particle is a distance r from the wire and is moving perpendicularly toward the wire with speed v . There is a magnetic force on the particle as a result of the current. Of the following five quantities, which could have a different value without changing the magnitude of the magnetic force on the particle, assuming the other four quantities remain constant?

• q

• m

• v

• I

• r

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A scientist is studying the radioactive decay of an element and wants to determine the sign of some of the particles emitted. The scientist lets a beam of the particles, all with the same speed, pass through an opening in a shield and enter the field created by a wire carrying a constant current. Paths 1 and 2 represent the observed paths of the particles. Based on the paths, which of the following could be the types of particles?

• Particle 1 = electron Particle 2 = alpha

• Particle 1 = alpha Particle 2 = electron

• Particle 1 = positron Particle 2 = alpha

• Particle 1 = alpha Particle 2 = positron

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The figure above shows a long, straight wire that has a steady current I in the +y-direction. A small object with charge +q hangs from a thread near the wire. A student wants to investigate the magnetic force on the object due to the current but is not able to observe or measure changes in the tension in the string. Of the following actions that the student can take, which will allow the student to observe a reaction of the object due to the magnetic force on it?

• Holding the object motionless

• Moving the object in a circle that is centered on the wire and in the x-z plane

• Moving the object in the –x-direction

• Moving the object in the +y-direction

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A wire in the plane of the page carries a current directed toward the top of the page as shown above. If the wire is located in a uniform magnetic field B directed out of the page, the force on the wire resulting from the magnetic field is

• directed into the page

• directed out of the page

• directed to the right

• directed to the left

• zero

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The ends of a metal bar rest on two horizontal north-south rails as shown above. The bar may slide without friction freely with its length horizontal and lying east and west as shown above. There is a magnetic field parallel to the rails and directed north. A battery is connected between the rails and causes the electrons in the bar to drift to the east. The resulting magnetic force on the bar is directed

• north

• south

• east

• west

• vertically

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A square loop of wire carrying a current I is initially in the plane of the page and is located in a uniform magnetic field B that points toward the bottom of the page, as shown above. Which of the following shows the correct initial rotation of the loop due to the force exerted on it by the magnetic field?

• 
• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Two long, parallel, straight wires in the plane of the page each carry a current I to the right, as shown above. Points P₁ and P₂ are in the plane of the page, with P₁ being midway between the wires. Which of the following is true of the net magnetic field at the two points that result from the two currents?

• P1 = out of page, P2 = into page

• P1 = out of page, P2 = out of page

• P1 = zero, P2 = into page

• P1 = zero, P2 = out of page

• P1 = into page, P2 = into page

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Two long parallel wires are a distance 2a apart, as shown above. Point P is in the plane of the wires and a distance a from wire X. When there is a current I in wire X and no current in wire Y, the magnitude of the magnetic field at P is B_o. When there are equal currents I in the same direction in both wires, the magnitude of the magnetic field at P is

• 2B_o/3

• B_o

• 10B_o/9

• 4B_o/3

• 2B_o

Tags

NGSS.HS-PS2-4

NGSS.HS-PS2-5

NGSS.HS-PS3-5