# Wright State University Lake Campus/2016-1/Phy1120/log/Maopageantgirl

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## 1/20 Effort to define field

Each field contains certain properties that have similar effects on the particles inside that respective field.

## Multiple choice questions

1. What is the best definition of a field pertaining to physics?

A) An area of space that requires an apparatus spread out over some distance in order to detect it.

B) A region in which each particle is affected by a non-contact force in various positions in space.

C) A zone of influence on particles.

D) Accumulated bulk concentrations of matter within an area.

Definition: A field is a function, usually of two or more variables, but traditionally not more than four. The simple field is a function of spatial dimensions X and Y. For example, altitude above sea level = h(x,y) is a field. Another field is surface temperature T(x,y) within a state in the USA.

A gravitational field is a function of three dimensions, and it is a vector field. To good approximation within a small region where x and y coordinates are Cartesian. g= g(z) where vector g points down with a magnitude of 9.8 m/s/s near z=0 altitude, and decreases slightly as you go above sea level.

Electric field

Symbol: E

Definition: Exerts a field on charge, F=qE, q= charge

F= q(E+ V * B) SI

2. What do I need to know in order to calculate the acceleration of a particle to a known electric field?

A) You need to know the mass of the particle and the charge.

B) You need to know the velocity and mass of the particle.

C) You need the force and the distance that the particle is traveling.

D) You need to know the mass and distance traveled by the particle.

Correct answer: A

3. Which comparison is true regarding gravatational and electromagnetic charge and inertia?

A) Both electromagnetic and gravatational charge is unrelated to inertia.

B) Gravational charge is unrelated to inertia. Electromagnetic charge is equivalent to inertia.

C) Both electromagnetic charge and gravatational charge is equivalent to inertia.

D) Gravational charge is equivalent to inertia. Electromagnetic charge is unrelated to inertia.

Correct answer: D