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Practice Questions



 This activity contains 25 questions.

Question 1.
The SI unit for the magnetic field is

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Question 2.
Which of the following is not a unit for the magnetic field?

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Question 3.

The red charge in the above figure is negative, the green is positive, and the blue is also negative. The magnetic field is into the page. What is the direction of the force on the red charge?

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Question 4.

The red charge in the above figure is negative, the green is positive, and the blue is also negative. The magnetic field is into the page. What is the direction of the force on the green charge?

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Question 5.

The illustration above is the same as that in Question 3 except that the magnetic field is out of the page. What is the direction of the force on the blue charge?

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Question 6.
What is the magnitude of the force on the blue charge if its charge is 1.5 C, its speed is 25 m/s and B is .2T?

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Question 7.

Both charges in the above figure are positive. What is the direction of the force on the red charge?

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Question 8.
In the preceeding question what is the direction of the force on the blue charge?

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Question 9.
If the blue charge in the previous question has a charge of 3.5 C, a speed of 30 m/s and B is 1.2 T, what is the magnitude of the magnetic force acting on it?

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Question 10.

What is the direction of the magnetic field from the left wire at the right wire?

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Question 11.
If the wires in Question 10 are separated by 15 cm and each carries a current of 10 A, what is the strength of the magnetic field from the left wire on the right wire?

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Question 12.
What is the direction of the force on the right in the preceeding question?

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Question 13.
What is the magnitude of the force per unit length on the right wire in the preceeding question?

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Question 14.

What is the direction of the magnetic field from the right wire at the left wire?

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Question 15.
What is the direction of the force on the left wire in the above question?

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Question 16.
What is the direction of the force on the wire on the right in Question 14?

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Question 17.

What is the direction of the force on the wire in the above figure?

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Question 18.
If the wire in the preceeding question is 2 meters long and carrying a current of 50 amps in a magnetic field of 0.4 T, what is the force on it?

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Question 19.

A current loop is shown edge-on in the figure. The loop carries 10 amps and has a surface area of 0.001 m2 in a magnetic field of 2 T; the torque on it (oriented as shown) is 1 Nm. What is the number of turns?

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Question 20.
What is the maximum torque on the current loop in Question 19?

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Question 21.
What is the magnetic dipole moment of the current loop in Question 19?

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Question 22.


The figure above illustrates a mass spectrometer. Positive ions (q = 1.6 x 10-19 C) leave the ion source and enter a velocity selector composed of two parallel metal plates 1 cm apart with a magnet field in the green region. The voltage on the plates is adjusted until the ions go straight across. What is the direction of the magnetic field in the green area?

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Question 23.
If the desired speed is 8.6 x 105 m/s and the proper voltage is 17200 volts, what is the strength of the magnetic field in the green region?

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Question 24.
The ions next enter the blue D-shaped area where the ions follow the semi-circular path that is shown above. What is the direction of the magnetic field in the blue area?

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Question 25.
If the magnetic field, B', in the blue area is 0.5 T and the radius of the semi-circular orbit is 25 centimeters, what is the mass of the ion?

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