14-нұсқа

An object _______ if it is less dense than the fluid it is in.

________ is the result of a force that is distributed over an area

An object ______ if it is more dense than the fluid it is in.

An object _______ if it is less dense than the fluid it is in.

What causes the Earth’s magnetic field?

• The movement of liquid iron in the Earth’s outer core

• The gravitational field of the Earth.

• The permanent magnet in the Earth’s core.

If a magnetic field B exerts a force F on a wire of length L with electric current in a magnetic field, then what value of the angle between the direction of the current i and the magnetic field B gives a maximum value for the magnitude of F?

• 180

• 45

• 90

• 120

• 0

• A

• B

• C

• D

• E

What can we infer from the graph of temperature against length shown?

• The metal bar is non - insulated

• The metal bar is insulated

• Not enough information given

• The metal bar is made up of 2 different material

• A 

• B

• C

• D