Physics Magnetism,Magnetic Effects Of Current Level: High School
Force on a current carrying conduction
A loop of wire with a weight of 1.47 N is oriented vertically and carries a current I = 1.75A . A segment of the wire passes through a magnetic field directed into the plane of the page as shown in the figure at ‘click here’ . The net force on the wire is measured using a balance and found to be zero . What is the magnitude of the magnetic field ?a) zero tesla
b) 0.51 T
c) 0.84 T
d) 1.5 T
e) 4.2 T
Physics Magnetism,Magnetic Effects Of Current Level: High School
Force on a moving charge
An electron traveling horizontally enters a region where a uniform magnetic field is directed into the plane of the paper as shown in the figure at “click here”. Which one of the following phrases most accurately describes the motion of the electron once it has entered the field ?a) upward and parabolic
b) upward and circular
c) downward and circular
d) upward, along a straight line
e) downward and parabolic
Physics Magnetism,Magnetic Effects Of Current Level: High School
Force on a moving charge
A proton traveling due east in a region that contains only a magnetic filed experiences a vertically upward force away from the surface of the earth . What is the direction of the magnetic field ?a) North
b) East
c) South
d) West
e) Down
Physics Electrostatics Level: High School
An uncharged 5.0 micro F capacitor and a resistor are connected in series to a 12-V battery and an open switch to form a simple RC circuit. The switch is closed at t = 0 s . The time constant of the circuit is 4.0 s . Determine the maximum charge on the capacitor .a) 6.0 x 10^-5 C
b) 9.5 x 10^-5 C
c) 1.5 x 10^-5 C
d) 4.8 x 10^-5 C
e) 5.5 x 10^-5 C
Physics Electrostatics Level: High School
Three parallel plate capacitors , each having a capacitance of 1.0 micro F are connected in parallel . The potential difference across the combination is 100 V . What is the charge on any one of the capacitors .a) 30 micro C
b) 100 micro C
c) 300 micro C
d) 1000 micro C
e) 3000 micro C
Physics Current Electricity Level: High School
A non-ideal battery has a 6.0 V emf and an internal resistance of 0.6 ohm . Determine the terminal voltage when the current drawn from the battery is 1.0 A .a) 5.0 V
b) 6.0 V
c) 5.4 V
d) 6.66 V
e) 5.8 V
Physics Current Electricity Level: High School
Some light bulbs are connected in parallel to a 120 V source as shown in the figure at “click here” . Each bulb dissipates an average power of 60 W. The circuit has a fuse F that burns out when the current in the circuit exceeds 9A . Determine the largest number of bulbs ,which can be used in the circuit without burning out the fuse .a) 9
b) 17
c) 25
d) 34
e) 36
Physics Alternating Current Level: High School
When a 1500-W hair dryer is in use , the current passing through the dryer may be represented as I = (17.7A) sin (120 pai t ) . What is the rms current for this circuit ?a) 17.7 A
b) 12.5 A
c) 85.7 A
d) 25.0 A
e) 8.85 A
Physics Current Electricity Level: High School
Which one of the following statements concerning superconductors is false ?a) Below is critical temperature, the resistivity of a superconductor is zero ohm-m
b) Critical temperatures for some superconductors exceed 100 K .
c) All materials are superconducting at temperatures near absolute zero Kelvin .
d) A constant current can be maintained in a superconducting ring for several years without an emf .
e) Superconductors are perfect conductors .
Physics Current Electricity Level: High School
How many electrons flow through a battery that delivers a current of 3.0 A for 12 s ?a) 4
b) 36
c) 4.8 x 10^15
d) 6.4 x 10^18
e) 2.2 x 10^20
Physics Electrostatics Level: High School
A parallel plate capacitor has a potential difference between its plates of 1.2 V and a plate separation distance of 2.0 mm . What is the magnitude of the electric field if a material that has a dielectric constant of 3.3 is inserted between the plates ?a) 75 V/m
b) 180 V/m
c) 250 V/m
d) 400 V/m
e) 500 V/m
Physics Electrostatics Level: High School
A charge is located at the center of sphere A (radius RA = 0.0010 m ) . which is in the center of sphere B (radius RB = 0.0012 m) . Spheres A and B are both equipotential surfaces . What is the ratio VA/VB for the potential of these surfaces ?a) 0.42
b) 0.83
c) 1.2
d) 1.4
e) 2.4
Physics Electrostatics Level: High School
If the work required to move a +0.35 C charge from point A to point B is +125 J , what is the potential difference between the two points ?a) zero volts.
b) 44 V
c) 88 V
d) 180 V
e) 360 V
Physics Electrostatics Level: High School
Two point charges are arranged along the x axis as shown in the figure at ‘click here’ . At which of the following values of x is the electric potential equal to zero ? Note : At infinity, the electric potential is zero .a) +0.05 m
b) +0.29 m
c) +0.40 m
d) +0.54 m
e) +0.71 m
Physics Electrostatics Level: High School
Two positive point charges are separated by a distance R. If the distance between the charges is reduced to R/2, what happen to the total electric potential energy of the system ?a) It is doubled
b) It remains the same
c) It increase by a factor of 4
d) It is reduced to one-half of its original value
e) It is reduced to one-fourth of its original value
