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What is a field in physics?

• A region of space where physical quantities are measured with instruments
• A region of space where a physical quantity is assigned to every point
• A region of space where only vectors can exist
• A region of space where only scalars can exist

Which of the following best describes a scalar field?

• A field where vectors represent physical quantities
• A field where tensors represent physical quantities
• A field where a number represents the physical quantity at each point
• A field where only forces can be measured

What is an example of a vector field?

• Temperature distribution in a room
• Pressure distribution in the atmosphere
• Meteorological wind map
• Density distribution in a fluid

How is an electric field defined?

• As a scalar field measuring electrical potential
• As a vector field measuring electric force per unit charge
• As a tensor field measuring electrical resistance
• As a field measuring electrical current

What characteristic of fields demonstrates they are real physical entities?

• They can only be seen with special equipment
• They require instruments to exist
• They occupy space and contain energy
• They only exist in laboratory conditions

How is an electric field similar to a wind field?

• Both can only be measured with electronic devices
• Both require large instruments for measurement
• Both can be measured using small test objects without affecting the field
• Both are always uniform in nature

When modeling a field at a point, what technique is used?

• Creating a mathematical equation
• Drawing a free-body diagram using field vectors
• Using computer simulations
• Measuring with electronic sensors

What happens when wind blows from two similar fans facing each other?

• The winds multiply their effects
• The winds create a circular motion
• The winds cancel each other out
• The winds create turbulence

What is a conductor in terms of electrical properties?

• A material that blocks electric charges
• A material through which electric charges can easily move
• A material that stores electric charges
• A material that converts electricity to heat

How do unbalanced charges behave on a conductor?

• They remain stationary
• They move inward
• They spread out across the surface
• They concentrate at the center