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WorksheetsCapacitors, Electromagnetism & Electromagnetic Induction
Total questions: 25
Worksheet time: 19mins
State the unit of Magnetic Flux?
(a)
What is the S.I. unit given to magnetic flux density?
(a)
What is the S.I. Unit of Capacitance?
(a)
Give the name of the device that is used the measure magnetic flux density?
(a)
The direction of the induced current is such that it tends to oppose the original change in flux is the law stated by?
(a)
Give the name of a device that works based on the principle of electromagnetism
(a)
Which of the following features of a transformer does not enhance the efficiency of a transformer?
insulated wires
laminated core
core made from soft-iron
metallic core
What type of force exists between two parallel current-carrying conductors carrying current in the same direction?
(a)
An ideal transformer has 5A and 12V turns on the primary, How much power is delivered to the secondary?
(a)
Which of the following scientists discovered that a changing magnetic field is required to induce an electric current?
Einstein
Lenz
Maxwell
Faraday
An AC generator has 100 turns and dimensions of 10cm x10cm is placed is a magnetic field of strength 2T. Given its frequency is 50Hz, what is the maximum emf that can be induced? (Give your answer in terms of pi)
(a)
Two capacitors are connected such that the voltage across each are the same. If the voltage is 5V and the capacitance of each is 1 microfarad, what is the total energy stored on the capacitors?
5 microjoules
10 microjoules
12.5 microjoules
25 microjoules
An ideal transformer has 500 turns on the secondary and 50 turns on the primary, How much voltage is in the secondary if there is 10V in the primary?
50V
100V
500V
1000V
How many factors affect the magnetic flux through a circular loop?
(a)
Give the name of a device that works based on the principle of electromagnetic Induction
(a)
The initial voltage across a capacitor is 12V. What is its voltage after two time constants?
1.2V
1.6V
3.0V
6V
An aircraft wingspan is 25m long. It passes through a magnetic field of strength 1.5T at a speed of 50m/s. What is the e.m.f induced on the wings to 2 significant figures?
1200V
1500V
1800V
1900V
A resistor of resistance 100 ohms is connected in series with a 10mF capacitor. What is its half-life?
0.693s
6.93s
693s
10s
When electrons pass through a section of a conductor that has a perpendicular magnetic field applied, an electric field is eventually set up causing the electrons to drift straight through. This describes the ...
(a)
Which of the following is the correct unit for permeability of free space?
Tesla
Tesla metre Ampere
Tesla metre per Ampere
Tesla per metre per Ampere
Which of the following equations are correct for the magnitude of the electric field strength when the Hall Effect occurs?
E = Bv
E = B/ v
E = v/B
none of the above
Give an eight (8) letter word starting with the letter 'c' that describes a charged particle movement in a magnetic field.
(a)
A circular loop of radius 10cm is placed in a magnetic field of strength 0.8T such that the normal to the plane of the loop is perpendicular to the magnetic field lines. What is the magnetic flux through the loop?
0Wb
8Wb
0.025Wb
80pi Wb
A capacitor is connected to a 12V battery and is fully charged. What fraction of the capacitor's voltage decayed after 4 half-lives?
1/8
1/16
15/16
1/32
An electron of charge, e, enters a magnetic field at right angles. Which of the following equations can be used to determine the momentum of this electron?
B/re
Ber
rB/e
e/Br
