PHY 102 Exam 2
A 60-W and a 100-W light bulb are connected in parallel to a 120-V outlet. Which bulb draws more current?
100-W bulb
The direction of the force exerted on a moving charge in a magnetic field is
at right angles to the direction of the motion
The unit of electrical resistance is the
Ohm
Whereas electric charges can be isolated, magnetic poles
cannot
The shape of a magnetic field surrounding a current-carrying conductor is
circular
An ampere is a unit of electric
current
Ohm's law tells us that the amount of current produced in a circuit is
directly proportional to voltage and inversely proportional to resistance
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
less than the resistance of either lamp
The voltage across a 10-ohm resistor carrying 5 A is
move than 20V
Two charged particles held close to each other are released. As they move, their speeds increase. Therefore, their charges have
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The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is
none of the above
The net charge on a charged capacitor depends on
none of the above
One joule per coulomb is a unit of
voltage
The electric power supplied to a lamp that carries 2 A at 120 V is
240 watts
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
F
The force that binds atoms together to form molecules is
electrical
Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is
electrical
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus
For electric current in the home, your power company supplies
energy
The conventional direction of magnetic field lines outside a magnet are from
north to south
A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is
perpendicular to the field lines