An electromagnet is a soft metal core made into a magnet by passing an electric current through a coil surrounding it. They only maintain their magnetism if current continues to flow, if switched off they lose their magnetism.
Mutiso answered the question on October 12, 2018 at 08:16
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Magnetic field due to solenoid
(Solved)
Magnetic field due to solenoid
Date posted:
October 12, 2018
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Rules for determining the direction of the lines of force
(Solved)
Rules for determining the direction of the lines of force.
Date posted:
October 12, 2018
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A vertical object 5 cm high is placed 10 cm in front of a convex mirror of focal length 15 cm. find the position, size...
(Solved)
A vertical object 5 cm high is placed 10 cm in front of a convex mirror of focal length 15 cm. find the position, size and nature of image formed. Determine the magnification of the image.
Date posted:
October 12, 2018
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Answers (1)
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Determine the size, position and nature of the image of an object 5.0 cm tall, placed on the principal axis of a concave mirror of...
(Solved)
Determine the size, position and nature of the image of an object 5.0 cm tall, placed on the principal axis of a concave mirror of focal length 15 cm, at a distance 35 cm from the mirror.
Date posted:
October 12, 2018
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Answers (1)
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State the applications of curved reflectors
(Solved)
State the applications of curved reflectors
Date posted:
October 12, 2018
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Location of images using ray diagrams
(Solved)
Location of images using ray diagrams.
Date posted:
October 12, 2018
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What are parabolic mirrors?
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What are parabolic mirrors?
Date posted:
October 12, 2018
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Name the parts of a spherical mirror
(Solved)
Name the parts of a spherical mirror.
Date posted:
October 12, 2018
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Illustrate concave and convex mirrors with aid of diagrams
(Solved)
Illustrate concave and convex mirrors with aid of diagrams
Date posted:
October 12, 2018
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Explain three states of equilibrium with aid of diagrams
(Solved)
Explain three states of equilibrium with aid of diagrams.
Date posted:
October 12, 2018
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Define the term stability
(Solved)
Define the term stability
Date posted:
October 12, 2018
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Answers (1)
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A uniform rod is 1.0 m long weighs 5 N. It is supported horizontally at one end by a spring and the other end rests...
(Solved)
A uniform rod is 1.0 m long weighs 5 N. It is supported horizontally at one end by a spring and the other end rests on a table as shown below. A mass of 2kg is hung from the rod as shown; determine,
a) Reading of the spring balance
b) Reaction force, F, from the table.
Date posted:
October 12, 2018
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Answers (1)
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A uniform rod of length 1.0 m is hung from a spring balance as shown and balanced in horizontal position by a force of 1.6...
(Solved)
A uniform rod of length 1.0 m is hung from a spring balance as shown and balanced in horizontal position by a force of 1.6 N. Determine; (a) The weight of the rod (b) Reading of the spring balance
Date posted:
October 12, 2018
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Answers (1)
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From the following diagram, determine the effort applied. (The bar is of negligible mass)
(Solved)
From the following diagram, determine the effort applied. (The bar is of negligible mass).
Date posted:
October 11, 2018
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Study the diagram below and determine the value of X and hence the length of the bar
(Solved)
Study the diagram below and determine the value of X and hence the length of the bar.
Date posted:
October 11, 2018
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Answers (1)
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The following bar is of negligible weight. Determine the value of ‘x’ if the bar is balanced.
(Solved)
The following bar is of negligible weight. Determine the value of ‘x’ if the bar is balanced.
Date posted:
October 11, 2018
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Answers (1)
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A uniform rod of negligible mass balances when a weight of 3 N is at A, weight of 3 N is at B and a...
(Solved)
A uniform rod of negligible mass balances when a weight of 3 N is at A, weight of 3 N is at B and a weight of W is at C. What is the value of weight W?
Date posted:
October 11, 2018
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Answers (1)
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Suppose an oil drop has a volume of 0.10 mm3 and forms a film with a radius of 10 cm. Calculate, the thickness of the...
(Solved)
Suppose an oil drop has a volume of 0.10 mm3 and forms a film with a radius of 10 cm. Calculate, the thickness of the oil film.
Date posted:
October 11, 2018
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Answers (1)
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A drop of olive oil, whose volume is 0.12 mm3, was placed on a surface of clean water.The oil spread and formed a patch of...
(Solved)
A drop of olive oil, whose volume is 0.12 mm3, was placed on a surface of clean water.
The oil spread and formed a patch of area 6.0 × 104 mm2. Estimate the size of the olive oil.
Date posted:
October 11, 2018
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Answers (1)
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Explain how to measure length using a micrometer screw gauge
(Solved)
Explain how to measure length using a micrometer screw gauge
Date posted:
October 11, 2018
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Answers (1)