An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s.What is the radius of the circle? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

A) 1.5 mm B) 0.22 mm C) 2.2 mm D) 0.39 mm E) 3.9 mm A) 1.5 mm B) 0.22 mm C) 2.2 mm D) 0.39 mm E) 3.9 mm

Exam 22: Magnetism

An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire.What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 41

For the horseshoe magnet shown in the figure,the left end is a north magnetic pole and the right end is a south magnetic pole.When the switch is closed in the circuit,which way will the wire between the poles of the horseshoe magnet initially deflect?

(Multiple Choice)

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Question 42

When you double the number of windings in an ideal solenoid while keeping all other parameters (radius,length and current)fixed,the magnetic field at the center of the solenoid will

(Multiple Choice)

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Question 43

A proton,moving in a uniform magnetic field,moves in a circle perpendicular to the field lines and takes time T for each circle.If the proton's speed tripled,what would now be its time to go around each circle?

(Multiple Choice)

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Question 44

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force.In what direction should the proton move?

(Multiple Choice)

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Question 45

A flat rectangular loop of wire is placed between the poles of a magnet,as shown in the figure.It has dimensions w = 0.60 m and L = 1.0 m,and carries a current I = 2.0 A in the direction shown.The magnetic field due to the magnet is uniform and of magnitude 0.80 T.The loop rotates in the magnetic field and at one point the plane of the loop is parallel to the field.At that instant,what is the magnitude of the torque acting on the wire due to the magnetic field?

(Multiple Choice)

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Question 46

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

(Multiple Choice)

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Question 47

When the switch is closed in the circuit shown in the figure,the wire between the poles of the horseshoe magnet deflects upward.From this you can conclude that the left end of the magnet is

(Multiple Choice)

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Question 48

A proton,moving east,enters a magnetic field.Because of this magnetic field the proton curves downward.We may conclude that the magnetic field must have a component

(Multiple Choice)

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Question 49

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same strength magnetic field?

(Multiple Choice)

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Question 50

A wire in the shape of an "M" lies in the plane of the paper.It carries a current of 2.0 A,flowing from A to E,as shown in the figure.It is placed in a uniform magnetic field of 0.55 T in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured.What are the magnitude and direction of the force acting on section CD of this wire?

(Multiple Choice)

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Question 51

An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the acceleration of the electron.(e = 1.60 × 10^-19 C,m_e₁ = 9.11 × 10^-31 kg)

(Multiple Choice)

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Question 52

A circular metal loop of radius 10 cm and three long straight wires carry currents of And As shown in the figure.Each of the straight wires is 20 cm from the center of the loop.The axes are shown in the figure,with the +z-axis coming out of the paper.What is the y component of the resultant magnetic field at the center of the loop? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 53

Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A.What is the magnitude of the force per unit length that each wire exerts on the other wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 54

An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm long.The windings carry a current in the sense shown in the figure.The current produces a magnetic field of magnitude At the center of the solenoid.What is the current I in the solenoid windings? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 55

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the magnetic field must have a component

(Multiple Choice)

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Question 56

A long wire carrying a 2.0-A current is placed along the y-axis.What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis? (μ₀ = 4π × 10^-7 T ∙ m/A)

(Multiple Choice)

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Question 57

An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10⁷ m/s.What is the radius of the circle? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

(Multiple Choice)

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Question 58

An electron is moving to the right,as shown in the figure.Suddenly it encounters uniform magnetic field pointing out of the page.Which one of the three paths shown will it follow in the field?

(Multiple Choice)

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Question 59

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current moves around the loop in a counterclockwise sense.For points on the tabletop inside the loop,the magnetic field lines caused by this current

(Multiple Choice)

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Question 60

Showing 41 - 60 of 147

Exam 22: Magnetism

An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire.What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (μ0 = 4π × 10-7 T ∙ m/A)

For the horseshoe magnet shown in the figure,the left end is a north magnetic pole and the right end is a south magnetic pole.When the switch is closed in the circuit,which way will the wire between the poles of the horseshoe magnet initially deflect?

When you double the number of windings in an ideal solenoid while keeping all other parameters (radius,length and current)fixed,the magnetic field at the center of the solenoid will

A proton,moving in a uniform magnetic field,moves in a circle perpendicular to the field lines and takes time T for each circle.If the proton's speed tripled,what would now be its time to go around each circle?

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force.In what direction should the proton move?

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C,mproton = 1.67 × 10-27 kg)

When the switch is closed in the circuit shown in the figure,the wire between the poles of the horseshoe magnet deflects upward.From this you can conclude that the left end of the magnet is

A proton,moving east,enters a magnetic field.Because of this magnetic field the proton curves downward.We may conclude that the magnetic field must have a component

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same strength magnetic field?

Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A.What is the magnitude of the force per unit length that each wire exerts on the other wire? (μ0 = 4π × 10-7 T ∙ m/A)

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the magnetic field must have a component

A long wire carrying a 2.0-A current is placed along the y-axis.What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis? (μ0 = 4π × 10-7 T ∙ m/A)

An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s.What is the radius of the circle? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

An electron is moving to the right,as shown in the figure.Suddenly it encounters uniform magnetic field pointing out of the page.Which one of the three paths shown will it follow in the field?

A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current moves around the loop in a counterclockwise sense.For points on the tabletop inside the loop,the magnetic field lines caused by this current

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An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire.What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (μ₀ = 4π × 10^-7 T ∙ m/A)

A proton,starting from rest,accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field.What is the radius of the proton's resulting orbit? (e = 1.60 × 10^-19 C,m_proton = 1.67 × 10^-27 kg)

Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A.What is the magnitude of the force per unit length that each wire exerts on the other wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A long wire carrying a 2.0-A current is placed along the y-axis.What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis? (μ₀ = 4π × 10^-7 T ∙ m/A)

An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10⁷ m/s.What is the radius of the circle? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)