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1. 7.55-μC charged particle with a speed of 30.50 m/s is found in a uniform magnetic field with magnitude 1.2 T. Solve for the magnitude of the magnetic force exerted on the charged particle if the particle is moving perpendicular to the field.
1. A resistor is connected in series with a capacitor, a switch that is in the open position and a battery.
Sketch a graph to show what would happen to the current in the circuit when the switch is closed and state the mathematical equation that describes the change in current in the circuit.
(5 marks)
2. (a) Sketch a waveform diagram showing the output of a piezoelectric ultrasonic transducer when it receives a reflection of ultrasound from an acoustic interface.
(2 marks)
(b) Assuming the transducer is made from “pzt”, how does the wavelength of the received wave relate to the transducer dimensions?
If an alpha particle has a velocity of magnitude 500m/s and travels horizontally in space in which there is an upward directed uniform electric field of magnitude 35N/C and a uniform magnetic field where the magnetic field makes an angle of 46⁰ with the particle's velocity vector such that it causes the alpha particle to pass through space undeflected,
How does the presence of the magnetic field causes the alpha particle to pass through undeflected and what happens to the alpha particle in the presence of the electric field?
Explain mutual induction.
A thunderbolt is made of an amount of charge travelling from clouds (at a given potential V1) to ground (at a given potential V2). We can think about it as a wire through which a certain amount of intensity current travels. In order to give an estimation of the amount of charge travelling in the thunderbolt, we measure the intensity of the magnetic field 150m apart from the thunderbolt. The value of B resulted to be 2.5 · 10−4T .
Determine the intensity of electrical current.
An iron bar 23cm with 0.12kg mass is placed perpendicular to a magnetic field B = 8 · 10−2T.
Determine direction and intensity of the current which has to travel through the bar such that the bar is suspended in air.
A conductive wire 23.5cm long is dipped in a magnetic field B, which is per- pendicular to the wire. A current i = 3.5A travels the wire and a force F = 2.2 · 10−4N acts on it.
Compute the value of the magnetic field B.
The circled dots indicate that the magnetic field is exiting from the plane of the paper
An alpha particle, with velocity of magnitude 500 m/s, travels horizontally into a region of space in which
there is an upward-directed uniform electric field of magnitude 36 N/C and a uniform magnetic field. The
magnetic field makes an angle of 41° with the particle’s velocity vector and is such that it causes the alpha
particle to pass through the region of space undeflected.
Explain how the presence of the magnetic field causes the alpha particle to pass through undeflected beginning with an explanation of what happens to the alpha particle in the presence of the electric field.
Also what will be the magnitude of the magnetic field that is required to cause the alpha particle to pass through undeflected.
An alpha particle has a velocity of magnitude 500m/s and travels horizontally in space which there is an upward-directed uniform electric field of magnitude 38 N/C and a uniform magnetic field. The magnetic field makes an angle of 42⁰ with the particle's velocity vector and such causes the alpha particle to pass through the region of space undeflected.
What will be the magnitude of the magnetic field that is required to cause the alpha particle to pass through undeflected beginning with electric force and magnetic force equations?
