Physics electric 1
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30 Terms
Q: How does electric force compare to gravity?
A: Much stronger
Q: Key difference between electric and gravitational force?
A: Electric can attract or repel; gravity only attracts
Q: What is an electric field?
A: A region around a charge where other charges feel a force
Q: What causes an electric field?
A: Charged objects
Q: Formula for electric field strength?
E = Fe / q
Q: Units of electric field strength?
A: N/C
Q: What affects electric field strength?
A: Charge magnitude and distance
Q: How does distance affect electric field strength?
A: Inverse relationship (farther = weaker)
Q: Direction of electric field?
A: Direction a positive test charge would move
Q: Field lines around a positive charge?
A: Point outward
Q: Field lines around a negative charge?
A: Point inward
Q: Where is electric field strongest?
A: Closest to the charge
Q: What do closer field lines mean?
A: Stronger field
Q: What happens in a uniform electric field (like plates)?
A: Force is constant throughout
Q: What happens to an electron in an electric field?
A: Moves opposite the field direction
Q: Where does an electron move between plates?
A: Toward the positive plate
Q: What is voltage?
A: Work done per unit charge
Q: Voltage equation?
V = w / q
Q: Units of voltage?
A: Volts (V)
Q: When is work done in an electric field?
A: When moving a charge against the field
Q: What happens to potential energy when moving against field?
A: It increases
Q: What are units of work/energy?
A: Joules (J) or electronvolts (eV)
Q: What are units of charge?
A: Coulombs (C) or elementary charge (e)
Q: Relationship between eV and Joules?
A: 1 eV = 1.6 × 10⁻¹⁹ J
Q: What causes static electricity?
A: Buildup of excess electrons on a surface
Q: What happens when you get shocked?
A: Electrons rapidly transfer between objects
Q: In Coulomb’s Law, how do you determine direction of force?
A: Based on charge signs (+/−), not the equation alone
Q: If one charge is positive and one is negative, what is the force direction?
A: Toward each other (attraction)
Q: Formula for electric field from a point charge?
E = kq / r²
Q: What does this mean conceptually?
A: Electric field depends only on the source charge, not the test charge