Yes, any kind of force(contact or non-contact) can act as a centripetal force as long as it is a attractive force acting between two bodies
Answer:1) d - it's always zero
2) a- 0
3) eta = - epsilon_0E
Explanation:
1) When a conductor is placed in an external electric field, the charges will accumulate to the two ends of the conductor depending on the direction of the field. As a result of this charge accumulation, the inside field develops and cancels with the outside field. Leaving the net field is always zero
2) we already know from answer 1, that there is a zero net electric field inside a conductor; therefore, if you surround any internal point with a Gaussian surface, there will be no flow at any point on this surface, and hence the surface will enclose zero net charge. Therefore, the charge density must be zero everywhere inside the conductor.
3) the charge density will be given as:
eta = - epsilon_0E
Answer:
T = (99.78 ±0.05) ºC
Explanation:
This problem refers to the procedure to perform the measurements and their correct reporting.
Suppose that the thermometer used has an appreciation of 0.1ºC and the values of 5 measurements resulted in
# T (ºC)
1 99.8
2 99.7
3 99.7
4 99.8
5 99.9
the processing calculate mean value
T_average = ∑ 
/ n
T_average = (99.8 + 99.7 + 99.7 + 99.8 + 99.9) / 5
T_average = 99.78ºC
the absolute error or uncertainty of the measurement is half the appreciation of the instrument
ΔT = ± 0.05ºC
so the result must be written
T = (99.78 ±0.05) ºC
Answer:
<em>a) A positive current will be induced in the coil</em>
Explanation:
Electromagnetic induction is the induction of an electric field on a conductor due to a changing magnetic field flux. The change in the flux can be by moving the magnet relative to the conductor, or by changing the intensity of the magnetic field of the magnet. In the case of this electromagnets<em>, the gradual increase in the the electromagnet's field strength will cause a flux change, which will in turn induce an electric current on the coil.</em>
According to Lenz law, the induced current acts in such a way as to negate the motion or action that is producing it. <em>A positive current will be induced on the coil so as to repel any form of attraction between the north pole of the electromagnet and the coil</em>. This law obeys the law of conservation of energy, since work has to be done to move the move them closer to themselves.
