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Electricity and Magnetism
charges of 3nC, -2nC, -7nC and 1nC are contained inside a rectangular box with length 1m width 2m and height 2.5m. Outside the boc are charges of 1nC and 4nC. What os the electric flux through the sirface.
Electricity and Magnetism
A proton is moving with velocity 6.7 x 10^4 m/s i + 3.6 x 10^4 m/s j in a magnetic field produced by the current-carrying wire at a point 5.6 cm from the wire. The current 6.7 A is passing through the wire in an upward direction. Find the acceleration of the proton
Electricity and Magnetism
Considering the below transformer U-Core:
https://upload.wikimedia.org/wikipedia/commons/8/81/U_core.png
When "Closing the U-Core" by placing a bar across the top (as per a recent experiment completed), what effect does changing the surface area of the bar in contact with one of the top segments (flat surface) of the U-Core. During the experiment one side of the U-Core - the secondary winding side was kept fully in contact with the bar "closing" the core, while the other side had varying overlaps of 10%, 50% and 100%. Voltage was increased from 0 --> 130V in steps of 10V. What appeared to happen was that the larger the overlap was the smaller the current in the primary current was and of course as the voltage increased so did the current. Is there any explanation to this - that the larger the surface area in contact with the primary winding results in a smaller current in the primary winding? Or any mathematics to tie into it. Any help greatly appreciated to help in my understanding.
https://upload.wikimedia.org/wikipedia/commons/8/81/U_core.png
When "Closing the U-Core" by placing a bar across the top (as per a recent experiment completed), what effect does changing the surface area of the bar in contact with one of the top segments (flat surface) of the U-Core. During the experiment one side of the U-Core - the secondary winding side was kept fully in contact with the bar "closing" the core, while the other side had varying overlaps of 10%, 50% and 100%. Voltage was increased from 0 --> 130V in steps of 10V. What appeared to happen was that the larger the overlap was the smaller the current in the primary current was and of course as the voltage increased so did the current. Is there any explanation to this - that the larger the surface area in contact with the primary winding results in a smaller current in the primary winding? Or any mathematics to tie into it. Any help greatly appreciated to help in my understanding.
Electricity and Magnetism
The magnetic field of the brain has been measured to be approximately 3pT. Even though complicated, the currents that cause the field can be obtained by modelling them as a single circular loop 16 cm in diameter. What current is needed to produce such a field at the center of the loop?
Electricity and Magnetism
A charged particle P is situated in a vacuum at a distance x from the centre of a charged
conducting sphere of radius r, as illustrated in Fig. 5.1.
For the particle P outside the conducting sphere, the charge on the sphere may be assumed to
be a point charge at its centre.
a) State Coulomb’s law.
b) The sphere and the particle P are both charged positively.
1. State the direction of the force acting on particle P.
2. State the position of particle P for the force to be maximum.
3. Determine the ratio:
force on particle P at x = r
force on particle P at x = 4r
conducting sphere of radius r, as illustrated in Fig. 5.1.
For the particle P outside the conducting sphere, the charge on the sphere may be assumed to
be a point charge at its centre.
a) State Coulomb’s law.
b) The sphere and the particle P are both charged positively.
1. State the direction of the force acting on particle P.
2. State the position of particle P for the force to be maximum.
3. Determine the ratio:
force on particle P at x = r
force on particle P at x = 4r
Electricity and Magnetism
the initial angular speed of the coil in the generator is 5 rad/s and the initial amplitude of the induced emf is 10 v.calculate the angular speed of the coil in the generator when the amplitude of the induced emf is 8v
Electricity and Magnetism
An alpha particle (2 protons + 2 neutrons) is brought to a stop by a potential difference of 450 V . What was its initial speed?
Express your answer using two significant figures.
Express your answer using two significant figures.
Electricity and Magnetism
Calculate the magnetic flux on a square sheet of slid 0.2m and on which a magnetic field of 2T is felt.
Electricity and Magnetism
A particle of mass
Electricity and Magnetism
Suppose the charge on the electron and proton did not
have the same magnitude but instead differed by one part in 10^10. What would be the net charge on a 1.0 kg of the helium sample
have the same magnitude but instead differed by one part in 10^10. What would be the net charge on a 1.0 kg of the helium sample
