If the magnetic field from a current-carrying long straight wire has a magnitude B0 at a distance d,what is the magnitude of the field at a distance 2d?

A) also B0 B) 0.707 B0 C) 0.693 B0 D) B0/2 E) B0/4 A) also B0 B) 0.707 B0 C) 0.693 B0 D) B0/2 E) B0/4

Exam 19: Magnetic Forces and Fields

A charged particle of enters a region of magnetic field at a speed of 2.8 $\times$ 10⁶ m/s,at an angle of 37 degrees relative to the magnetic field direction.If the magnetic field strength is 1.2 T and the charge of the particle is +e,and the radius of the helical path is 8.9 cm,what is the particle's mass?

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Question 1

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The magnetic field lines inside a bar magnet go in what direction?

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(Multiple Choice)

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Question 2

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The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is

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Question 3

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A velocity selector for ions uses perpendicular electric and magnetic fields.If the electric field used were 800 V/m,what magnetic field would allow the selection of a velocity of 4000 m/s?

(Multiple Choice)

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Question 4

A cyclotron with a magnetic field of 1.2 T is used to accelerate protons.How long does it take for the protons to make one complete trip around the cyclotron at a radius of 25 cm?

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Question 5

In a velocity selector for ions,when the velocity of the ions is double the value for which the selector is set,how do the magnetic force F_M and the electric force F_E compare?

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Question 6

A 300 turn coil of area 25 cm² is placed in an 80 mT magnetic field.If the coil carries a current of 3.3 A and if the normal to the area of the coil makes an angle of 20 $^{\circ}$ with the direction of the magnetic field,what is the magnitude of the torque on the coil?

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Question 7

When measuring the Hall voltage,what happens to the reading when the current is increased 20%?

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Question 8

An electric field perpendicular to a magnetic field is used as a velocity selector for Li⁺ ions, selecting the velocity v₁. Next, Li⁺⁺ ions are sent through the same velocity selector,selecting velocity v₂.If neither the electric nor magnetic fields have changed between the two processes,how do v₁ and v₂ compare?

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Question 9

A cyclotron is designed to accelerate protons (mass 1.67 $\times$ 10^-27 kg) up to a kinetic energy of 2.5 $\times$ 10^-13 J.If the radius of the dipole magnets is 96 cm, what is the magnetic field used in the cyclotron?

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Question 10

A cyclotron is designed to accelerate protons (mass 1.67 $\times$ 10^-27 kg) up to a kinetic energy of 2.5 $\times$ 10^-13 J. If the magnetic field in the cyclotron is 0.75 T,what is the radius of the dipole magnets in the cyclotron?

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Question 11

A 3.0 cm section of a horizontal wire carrying a 6.7 A current from east to west is place in a north to south 0.42 T magnetic field in the lab.In what direction is the magnetic force on the 3.0 cm section?

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Question 12

The magnitude of the magnetic force on a charge depends on

(Multiple Choice)

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Question 13

If the magnetic field from a current-carrying long straight wire has a magnitude B₀ at a distance d,what is the magnitude of the field at a distance 2d?

(Multiple Choice)

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Question 14

A 2.5 cm-long horizontal wire segment has mass 0.15 g and carries a current sufficiently large that it levitates when the segment is in a region of B field upward with magnitude 1.5 T.The current is passed to the segment that is in the magnetic field by way of massless electrical leads.What is the magnitude of the current that the wire carries?

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Question 15

A charged particle having electric charge Q = 4.0 e enters a region of magnetic field 1.2 T at an angle of $\theta$ relative to the magnetic field direction.If the speed of the particle upon entering the region is 2.8 $\times$ 10⁴ m/s and the magnitude of the force on it is 1.3 $\times$ 10^-14 N,what is the angle $\theta$ ?

(Multiple Choice)

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Question 16

Two parallel wires are each carrying 10 A and are separated by 4.0 m.If the currents are in opposite directions,what is the magnitude of the magnetic field halfway between them?

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Question 17

Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 2.0 $\times$ 10⁷ m/s by a horizontal magnetic field of 0.50 T directed north.

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Question 18

In ancient times permanent magnets were known to the Greeks.These magnets were chunks of iron ore now called magnetite.What is the older name for this material?

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Question 19

A charged particle having electric charge Q = 4.0 e enters a region of magnetic field 1.2 T at an angle of 37 degrees relative to the magnetic field direction.If the speed of the particle upon entering the region is 2.8 $\times$ 10⁴ m/s,what is the magnitude of the force on it?

(Multiple Choice)

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Question 20

Showing 1 - 20 of 72

Exam 19: Magnetic Forces and Fields

The magnetic field lines inside a bar magnet go in what direction?

The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is

A velocity selector for ions uses perpendicular electric and magnetic fields.If the electric field used were 800 V/m,what magnetic field would allow the selection of a velocity of 4000 m/s?

A cyclotron with a magnetic field of 1.2 T is used to accelerate protons.How long does it take for the protons to make one complete trip around the cyclotron at a radius of 25 cm?

In a velocity selector for ions,when the velocity of the ions is double the value for which the selector is set,how do the magnetic force FM and the electric force FE compare?

A 300 turn coil of area 25 cm2 is placed in an 80 mT magnetic field.If the coil carries a current of 3.3 A and if the normal to the area of the coil makes an angle of 20 ∘^{\circ}∘ with the direction of the magnetic field,what is the magnitude of the torque on the coil?

When measuring the Hall voltage,what happens to the reading when the current is increased 20%?

A cyclotron is designed to accelerate protons (mass 1.67 ×\times× 10-27 kg) up to a kinetic energy of 2.5 ×\times× 10-13 J.If the radius of the dipole magnets is 96 cm, what is the magnetic field used in the cyclotron?

A cyclotron is designed to accelerate protons (mass 1.67 ×\times× 10-27 kg) up to a kinetic energy of 2.5 ×\times× 10-13 J. If the magnetic field in the cyclotron is 0.75 T,what is the radius of the dipole magnets in the cyclotron?

A 3.0 cm section of a horizontal wire carrying a 6.7 A current from east to west is place in a north to south 0.42 T magnetic field in the lab.In what direction is the magnetic force on the 3.0 cm section?

The magnitude of the magnetic force on a charge depends on

If the magnetic field from a current-carrying long straight wire has a magnitude B0 at a distance d,what is the magnitude of the field at a distance 2d?

Two parallel wires are each carrying 10 A and are separated by 4.0 m.If the currents are in opposite directions,what is the magnitude of the magnetic field halfway between them?

Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 2.0 ×\times× 107 m/s by a horizontal magnetic field of 0.50 T directed north.

In ancient times permanent magnets were known to the Greeks.These magnets were chunks of iron ore now called magnetite.What is the older name for this material?

A charged particle having electric charge Q = 4.0 e enters a region of magnetic field 1.2 T at an angle of 37 degrees relative to the magnetic field direction.If the speed of the particle upon entering the region is 2.8 ×\times× 104 m/s,what is the magnitude of the force on it?

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In a velocity selector for ions,when the velocity of the ions is double the value for which the selector is set,how do the magnetic force F_M and the electric force F_E compare?

A 300 turn coil of area 25 cm² is placed in an 80 mT magnetic field.If the coil carries a current of 3.3 A and if the normal to the area of the coil makes an angle of 20 $^{\circ}$ with the direction of the magnetic field,what is the magnitude of the torque on the coil?

A cyclotron is designed to accelerate protons (mass 1.67 $\times$ 10^-27 kg) up to a kinetic energy of 2.5 $\times$ 10^-13 J.If the radius of the dipole magnets is 96 cm, what is the magnetic field used in the cyclotron?

A cyclotron is designed to accelerate protons (mass 1.67 $\times$ 10^-27 kg) up to a kinetic energy of 2.5 $\times$ 10^-13 J. If the magnetic field in the cyclotron is 0.75 T,what is the radius of the dipole magnets in the cyclotron?

If the magnetic field from a current-carrying long straight wire has a magnitude B₀ at a distance d,what is the magnitude of the field at a distance 2d?

Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 2.0 $\times$ 10⁷ m/s by a horizontal magnetic field of 0.50 T directed north.

A charged particle having electric charge Q = 4.0 e enters a region of magnetic field 1.2 T at an angle of 37 degrees relative to the magnetic field direction.If the speed of the particle upon entering the region is 2.8 $\times$ 10⁴ m/s,what is the magnitude of the force on it?