PHYS 1260 UPDATED TESTED QUESTIONS AND
ANSWERS GRADED A+
✔✔when the current reverses direction in a wire, the surrounding magnetic field -
✔✔also reverses direction
✔✔when a magnetic flux changes as a function of time, an electric field is - ✔✔induced
in the surrounding space
✔✔when a magnet is moved to and fro in a wire coil, voltage is induced. if the coil has
twice as many loops, the voltage induced is - ✔✔twice
✔✔when a change occurs in the magnetic field in a closed loop of wire - ✔✔-a voltage
is induced in the wire
-a current is created in the loop of wire
-the electromagnetic induction occurs
✔✔when two lamps are connected in series to a battery, the electrical resistance that
the battery "senses" is - ✔✔more than the resistance of either lamp
✔✔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 force on an electron moving in a magnetic field will be least when its direction is
- ✔✔the same as the magnetic field direction
✔✔the amount of current produced by electromagnetic induction depends on the - ✔✔-
amount of induced voltage
-resistance of the circuit to which it is connected
✔✔electromagnetic induction occurs in a coil when there is change in - ✔✔magnetic
field intensity in the coil
✔✔on some early automobiles, both headlights failed when one bulb burned out. the
headlights were likely connected in - ✔✔series
✔✔Magnet A has twice the magnetic field strength of Magnet B and at a certain
distance pulls on magnet B with a force of 100 N. The amount of force that magnet A
exerts on magnet B is - ✔✔exactly 100N
✔✔compared to the huge force that attracts an ion tack to a strong magnet, the force
that the tack exerts on the magnet - ✔✔equally huge
, ✔✔like kinds of magnetic poles repel while unlike kinds of magnetic poles - ✔✔attract
✔✔whereas electric charges can be isolated, magnetic poles - ✔✔cannot
✔✔surrounding every stationary electron is - ✔✔an electric field
✔✔surrounding every moving electron is - ✔✔-a magnetic field
-an electric field
✔✔the shape of a magnetic field surrounding a current-carrying conductor is -
✔✔circular
✔✔the frequency of induced voltage in a wire coil depends on - ✔✔how frequently a
magnet dips in and out of the coil
✔✔junction rule - ✔✔sum of all currents equal to 0
✔✔loop rule - ✔✔sum of all potential differences equal to 0
✔✔current is same in - ✔✔series
✔✔"voltage drop" is same in - ✔✔parallel
✔✔equivalent resistance of series - ✔✔Req = R1 + R2 + R3
✔✔equivalent resistance of parallel - ✔✔1/Req = 1/R1 + 1/R2 + 1/R3
✔✔magnetic force - ✔✔F=|q|vBsin(theta)
✔✔motion of a point charge in a magnetic field - ✔✔-magnetic filed takes note of
centripetal force
-magnetic fields do NO work
✔✔no charge, no deflection - ✔✔it goes straight
✔✔e-field begin - ✔✔at positive charges and end at negative charges
✔✔b-field lines ALWAYS - ✔✔form closed paths
✔✔a convention that helps us make sense of the phenomenon that electromagnetic
induction attempts to undo any change in the magnetic flux - ✔✔lenz's law
✔✔time varying current---time varying b-field---induced emf - ✔✔self-induction
ANSWERS GRADED A+
✔✔when the current reverses direction in a wire, the surrounding magnetic field -
✔✔also reverses direction
✔✔when a magnetic flux changes as a function of time, an electric field is - ✔✔induced
in the surrounding space
✔✔when a magnet is moved to and fro in a wire coil, voltage is induced. if the coil has
twice as many loops, the voltage induced is - ✔✔twice
✔✔when a change occurs in the magnetic field in a closed loop of wire - ✔✔-a voltage
is induced in the wire
-a current is created in the loop of wire
-the electromagnetic induction occurs
✔✔when two lamps are connected in series to a battery, the electrical resistance that
the battery "senses" is - ✔✔more than the resistance of either lamp
✔✔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 force on an electron moving in a magnetic field will be least when its direction is
- ✔✔the same as the magnetic field direction
✔✔the amount of current produced by electromagnetic induction depends on the - ✔✔-
amount of induced voltage
-resistance of the circuit to which it is connected
✔✔electromagnetic induction occurs in a coil when there is change in - ✔✔magnetic
field intensity in the coil
✔✔on some early automobiles, both headlights failed when one bulb burned out. the
headlights were likely connected in - ✔✔series
✔✔Magnet A has twice the magnetic field strength of Magnet B and at a certain
distance pulls on magnet B with a force of 100 N. The amount of force that magnet A
exerts on magnet B is - ✔✔exactly 100N
✔✔compared to the huge force that attracts an ion tack to a strong magnet, the force
that the tack exerts on the magnet - ✔✔equally huge
, ✔✔like kinds of magnetic poles repel while unlike kinds of magnetic poles - ✔✔attract
✔✔whereas electric charges can be isolated, magnetic poles - ✔✔cannot
✔✔surrounding every stationary electron is - ✔✔an electric field
✔✔surrounding every moving electron is - ✔✔-a magnetic field
-an electric field
✔✔the shape of a magnetic field surrounding a current-carrying conductor is -
✔✔circular
✔✔the frequency of induced voltage in a wire coil depends on - ✔✔how frequently a
magnet dips in and out of the coil
✔✔junction rule - ✔✔sum of all currents equal to 0
✔✔loop rule - ✔✔sum of all potential differences equal to 0
✔✔current is same in - ✔✔series
✔✔"voltage drop" is same in - ✔✔parallel
✔✔equivalent resistance of series - ✔✔Req = R1 + R2 + R3
✔✔equivalent resistance of parallel - ✔✔1/Req = 1/R1 + 1/R2 + 1/R3
✔✔magnetic force - ✔✔F=|q|vBsin(theta)
✔✔motion of a point charge in a magnetic field - ✔✔-magnetic filed takes note of
centripetal force
-magnetic fields do NO work
✔✔no charge, no deflection - ✔✔it goes straight
✔✔e-field begin - ✔✔at positive charges and end at negative charges
✔✔b-field lines ALWAYS - ✔✔form closed paths
✔✔a convention that helps us make sense of the phenomenon that electromagnetic
induction attempts to undo any change in the magnetic flux - ✔✔lenz's law
✔✔time varying current---time varying b-field---induced emf - ✔✔self-induction
