IB-D.3 Part 2

What is the shape of a magnetic field around a wire?

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What is the shape of a magnetic field around a coil?

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What does the following represent?

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

• Multiplied by a billion

• A piece of modern art

• Uniform magnetic field directed into the screen away from you

• Uniform magnetic field directed out of your screen at you

A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT: F=I.L.B

• = 0.18 N
• = 0.18 T
• = 0.18 Cm
• = 0.18 

The SI unit of magnetic field is

• weber

• gauss

• tesla

• farad

magnetic flux density = 0.45 T, current = 1.37 A, length = 1.9 m, force on a conductor carrying a current = ?

• 0.0851

• 1.17

• 0.317

• 0.106

force on a conductor carrying a current = 2.43 N, magnetic flux density = 2.69 T, length = 8.5 m, current = ?

• 0.0851

• 1.17

• 0.317

• 0.106

A particle of charge +Q moving with speed v₀ enters a region of constant magnetic field B directed into the page, as shown above. The initial direction and magnitude of the acceleration of the particle as it enters the magnetic field is toward the

• bottom of the page and proportional to B

• bottom of the page and proportional to v₀

• top of the page and inversely proportional to v₀

• top of the page and inversely proportional to B

• top of the page and proportional to both B and v₀

An object with charge +q passes to the right of one pole of a magnet and at a particular instant is moving with a velocity v toward the bottom of the page, as shown in the figure above. The force exerted on the object by the magnet at that instant is directed into the page. What is the direction of the force exerted on the magnet by the object?

• Out of the page

• Toward the right

• Toward the top of the page

• No direction; the force is zero.

At the instant shown above, an electron is moving to the right along a straight line midway between two identical bar magnets. Which of the following describes the path of the electron as it continues to move?

• It remains on the straight line and passes completely between the magnets.

• It curves upward and strikes the top magnet.

• It curves downward and reverses direction before it enters the space between the magnets.

• It stops and reverses direction, then moves to the left along the same straight line.