Physics Alternating Current Level: High School
A sine wave has a peak value of 12V . Determine the rms, peak to peak , and half cycle average ?
Physics Alternating Current Level: High School
Sine wave frequency of 50 kHz . How many cycles does it complete in 10 ms ?
Physics Alternating Current Level: High School
A sine wave goes through 5 cycles in 10 micro seconds . What is it period ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
A circular loop carrying a current of 1.0 A is oriented in a magnetic field of 0.35 T . The loop has an area of 0.24 m2 and is mounted on an axis , perpendicular to the magnetic field , which allows the loop to rotate . If the plane of the loop is oriented parallel to the field , What torque is created by the interaction of the loop current and field ?
a. 5.8 N.m
b. 0.68 N.m
c. 0.084 N.m
d. 0.017 N.m
Physics Magnetism,Magnetic Effects Of Current Level: High School
Which of the following devices makes use of an electromagnet ?
A. loudspeaker
B. galvanometer
C. both A and B
D. None of the above
(c) both A and B .
Physics Magnetism,Magnetic Effects Of Current Level: High School
A copper wire of length 25 cm is in a magnetic field of 0.20 T . If it has a mass of 10 g . What is the minimum current through the wire that would cause a magnetic force equal to its weight ?
a. 1.3 A
b. 1.5 A
c. 2.0 A
d. 4.9 A
Physics Magnetism,Magnetic Effects Of Current Level: High School
An electron moves through a region of crossed electric and magnetic field . The electric field E = 2000 V/m and is directed straight down . The magnetic field B = 0.80 T and is directed to the left . For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force?
a. 2500 m/s
b. 4000 m/s
c. 5000 m/s
d. 8000 m/s
Physics Current Electricity Level: High School
A proton moving at a speed of 3.8 x 106 m/s cuts across the lines of a magnetic field at an angle of 70 degree. The strength of the field is 0.25 x 10-4 T. What is the magnitude of the force acting on the proton ? (qp = 1.6 x 10 – 19C)a. 5.1 x 10-18 N
b. 9.0 x 10-18 N
c. 1.4 x 10 -17 N
d. 2.3 x 10-17 N
Physics Magnetism,Magnetic Effects Of Current Level: High School
Assume that a uniform magnetic field is directed into this page . If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the electron ?
a. out of the page
b. to the right
c. to the left
d. into the page
Physics Current Electricity Level: High School
The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field ?a. zero
b. 180 degree
c. 90 degree
d. 45 degree
Physics Magnetism,Magnetic Effects Of Current Level: High School
The magnetic pole of the Earth nearest the geographic North Pole corresponds to which of the following ?
a. a magnetic north pole
b. a magnetic south pole
c. a magnetic artic pole
d. a magnetic antarctic pole
(b) a magnetic south pole
Physics Current Electricity Level: High School
The household circuits are wired ina. series
b. parallel
c. both series and parallel
d. neither series nor parallel
Physics Current Electricity Level: High School
As per the figure at “click here” A 10 V emf battery is connected in series with the following : a 2 microF capacitor , a 2ohm resistor , an ammeter , and a switch, initially open; a voltmeter is connected in parallel across the capacitor . At the instant the switch is closed, what are the current and capacitor voltage reading , respectively ;a. zero A. 10 V
b. zero A. zero V
c. 5 A . Zero V
d. 5 A. 10 V
Physics Current Electricity Level: High School
If one double the emf in a circuit and double the resistance in the circuit at the same time. What happens to the currents through the resistors ? Assume there are only emfs and resistors in the circuit .a. They stay the same
b. They quadruple
c. They double
d. They halve
Physics Current Electricity Level: High School
As per the figure at “click here” , what is the current flowing through the 4 ohm resistor ?a. 1 A
b. 2 A
c. 3 A
d. 4 A
