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WorksheetsElectro-magnetic Fields
Total questions: 10
Worksheet time: 11mins
A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter. How could the student increase the Voltage.
increasing the number of turns on the coil
increasing the speed of the magnet
increasing the strength of the magnet
all of the above
A flat coil consists of 20 turns each of area
an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms , what is the magnitude of the induced current?
70 mA
140 mA
500 mA
800 mA
According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
enhance the effect which produces it
produce a greater heating effect
produce the greatest voltage
oppose the effect which produces it
Magnetic flux is related to magnetic field strength by the formula
Φ=BA
Φ=BA2
Φ=B/A
Φ=B/A2
A uniform magnetic field of strength 4 mT is used to deflect a beam of electrons into a circular path of diameter 65 mm. Calculate the speed of the electrons
2.3x107ms-1
4.6x107ms-1
3.0x107ms-1
2.0x107ms-1
Which line, A to D, gives correct units for both magnetic flux and magnetic flux density?
A
B
C
D
