Chapter 7 Magnetism and Their Uses

define the term magnetic field

• a region of space near a magnet, electric current or moving electrically charged particle in which a magnetic force acts on any other magnet, electric current or moving electrically charged particle

• the region of space surrounding a body in which another body experiences a force of gravitational attraction.

• the physical field that surrounds each electric charge and exerts force on all other charges in the field, either attracting or repelling them.

• A place where rugby is played

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A straight wire carries a current into the page as shown in Figure 1. What is the direction of the magnetic field at a point east of the wire?

• North

• South

• East

• West

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The diagram in Figure 3 shows a current-carrying wire in a magnetic field. Which one of the following best describes the direction of the force on the wire?

• out of page

• into page

• perpendicular to angle θ

• at angle θ to the direction of the field

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Calculate the field strength inside a solenoid made up of 800 turns of wire on a 20 cm length of plastic tube if the wire carries a current of 700 mA.

• 2.532 x 10^-3 T

• 1.633 x 10^-3 T

• 5.502 x 10^-3 T

• 3.528 x 10^-3 T

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A proton of mass 1.67 × 10–27 kg and charge +1.6 × 10–19 C enters a magnetic field of strength B = 3.0 × 10–2 T at right angles to the field and with a velocity of 2.5 × 105 m s–1.

Calculate the magnitude of the force on the proton.

• 3.2 x 10^-15 N

• 10 x 10^-15 N

• 1.2 x 10^-15 N

• 1.56 x 10^-15 N

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An electron (qe = –1.6 × 10–19 C) is fired at right angles into a 1.2 T uniform magnetic field at 3 × 107 m s–1. Determine the magnitude of the force acting on it.

• 5.76 x 10^-12 N

• 6.66 x 10^-12 N

• 10.23 x 10^-12 N

• 3.22 x 10^-12 N

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A wire of length 1.4 m is placed entirely in a magnetic field of strength 0.85 T and carries a current of 2.37 A (Figure 5). The wire experiences a force of 1.19 N.

Determine the angle θ it must make with the field.

• 20 degrees

• 25 degrees

• 30 degrees

• 45 degrees

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A wire of length 1.4 m is placed entirely in a magnetic field of strength 0.85 T and carries a current of 2.37 A (Figure 5). The wire experiences a force of 1.19 N.

Determine the direction of the force.

• Out of page

• Into page

• To the right

• To the left

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Two parallel conductors 40.0 mm apart carry currents of 3.0 A (left wire) and 2.0 A (right wire), as shown in Figure 6.

Calculate the magnitude and direction of the magnetic field at point Y midway between the wires.

• 5 x 10^-5 up

• 5 x 10^-5 down

• 7 x 10^-5 up

• 7 x 10^-downup

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Figure 10 shows a 3500 turn circular solenoid of diameter 3.0 cm and length 70.0 cm carrying an input current of 75 mA flowing east. The current circulates clockwise as shown.

Determine the field strength (magnitude and direction) at point X, the centre of the loop.

• 2.76 x 10^-3 T into page

• 3.23 x 10^-3 T out of page

• 1.86 x 10^-3 T into page

• 4.54 x 10^-3 T out of page

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