# Shared Flashcard Set

## Details

MCAT Physics
A brief overview of some of the subjects presented on the MCAT in physics.
4
Physics
01/21/2010

Term
 What is the electric field E at a distance d=4cm from a positive charge of Q=10^-4C on the tip of a glass rod?
Definition
 E=kQ/d^2 so E=5.6x10^8 N/C which is 5.6x10^8 V/m. The direction of the electric field is away from the glass rod.
Term
 In electric field E of 300 V/m=300N/C, what is the force F on a charge of 10^-4 C?
Definition
 F=QE, which is 0.03N
Term
 The electric field E 1m away from a point charge has magnitude 24,300 V/m. What is its magnitude 3m away? What does the electric field E 1m away from the source become when every charge in the system is made 1/3 as large?
Definition
 Because E is proportional to 1/d^2, the field 3m away is 1/9 as large as the field 1m away, 2700V/m. If the charge is reduced to 1/3 its original value, the field everywhere becomes 1/3 as large: 8100 V/m at 1m and 900V/m at 3m.
Term
 Two metal plates are separated by 3cm and have length and width much greater than their separation. The potential difference between them is 30,000V. What is the magnitude of the electric field E halfway between the two plates? What is the magnitude of the electric field E outside of them?
Definition
 Between the plates deltaV=Ed so E=10^6V/m. Outside the region, the field is much smaller.
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