A coil to be operated in air has 200 loops in a length of 3 cm. What current is required to produce a flux density of 0.02 T?

What will be an ideal response?


Because the coil is in air there is little error in using the permeability of a vacuum.





Physics & Space Science

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A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about

A) 1.1 m/s. B) 1.5 m/s. C) 2.5 m/s. D) none of the above

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A photon of wavelength 29 pm is scattered by a stationary electron. What is the maximum possible energy loss of the photon? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)

A) 7.0 keV B) 10 keV C) 12 keV D) 4.0 keV E) 6.1 keV

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When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the

A) ball. B) floor. C) need more information

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Which of the following best describes the meaning of "force"?

A) A body's force is the tendency of that body to continue moving once it is started moving. B) A force is a change in velocity. C) The force of a moving body is the distance the body travels divided by the time it takes to travel that distance. D) A body exerts a force on another body when the first body causes the second body to accelerate. E) The force that a body has is the amount of work that the body can do.

Physics & Space Science