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Kitty [74]
3 years ago
11

which of the following would decrease current flow in a circuit made originally from 1.5 volt battery, a loop of wire and a swit

ch
Physics
1 answer:
amid [387]3 years ago
4 0
 21. Magnetism is produced by the motion of electrons as they a. move around the nucleus. b. spin on their axes. c. both A and B d. none of the above 22. If you put a small compass in a magnetic field, the compass will a. line up in a direction parallel to the magnetic field lines. b. swing randomly. c. line up in a direction perpendicular to the magnetic field lines. d. seek electrical charge concentrations. 23. Magnetic field strength is a. strongest close to a magnet. b. constant everywhere around a magnet. c. strongest far from a magnet. 24. Magnetic domains are a. regions that may or may not be magnetized. b. clusters of atoms randomly aligned. c. regions of atoms magnetically aligned. d. blocks of material. 25. Earth's magnetic field is most likely due to a. millions of small magnets buried in Earth. b. a magnetized solid inner core of Earth. c. convection currents in the molten part of Earth's interior. d. the rotation of Earth acting on all of Earth's electrons. 
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A very large sheet of insulating material has had an excess of electrons placed on it to a surface charge density of –3.00nC/m2
lys-0071 [83]

Answer: sheet of charge

Explanation:

a )

Since the charge is negative , potential will be negative near it . At a far point potential will be less negative. So potential will virtually increase on going away from the sheet . At infinity it will become almost zero. Electric field will be towards the plate , so potential will decrease towards the plate.

b ) The shape of equi -potential surface will be plane parallel to the sheet of charge because electric field will be perpendicular to the sheet of charge and almost uniform near the sheet of charge.   The equi- potential surface is always perpendicular to electric field.

C ) Electric field which is almost uniform near the sheet of charge is equal t the following

E = σ / ε₀ where  σ is charge density of surface and  ε₀ is permittivity of medium whose value is 8.85 x 10⁻¹²

E = 3 x 10⁻⁹ / 8.85 x 10⁻¹²

= .3389 x 10³

= 338.9 V / m

spacing between 1 V

= 1 / 338.9 m

= 2.95 X 10⁻3 m

= 2.95 mm.

3 0
3 years ago
Two identical copper blocks are connected by a weightless, unstretchable cord through a frictionless pulley at the top of a thin
likoan [24]

Answer:

13.6 N

Explanation:

Since one side of the wedge is vertical and the wedge makes and angle of 33 with the horizontal, the angle between the weight of the copper block on the incline and the incline is thus 90 - 33 = 57.

Let M be the mass of the block that hangs, m be the mass of the block on the incline and T be the tension in the weightless unstretchable cord.

We assume the motion is downwards in the direction of the hanging block, M.

We now write equations of motion for each block.

So

Mg - T = Ma    (1) and T - mgcos57 - F = ma where F is the frictional force on the block on the incline and a is their acceleration.

Now, since both blocks do not move, a = 0.

So, Mg - T = M(0) = 0     and T - mgcos57 - F = m(0) = 0

Mg - T = 0    (3) and T - mgcos57 - F = 0 (4)

From (3), T = Mg

Substituting T into (4), we have

T - mgcos57 - F = 0

Mg - mgcos57 - F = 0

So, Mg - mgcos57 = F  

F = Mg - mgcos57

F = (M - mcos57)g

Since g = acceleration due to gravity = 9.8 m/s², and M = 2.94 kg and m = 2.85 kg.

We find F, thus

F = (2.94 kg - 2.85 kgcos57)9.8 m/s²

F = (2.94 kg - 2.85 kg × 0.5446)9.8 m/s²

F = (2.94 kg - 1.552 kg)9.8 m/s²

F = (1.388 kg)9.8 m/s²

F = 13.6024 kgm/s²

F ≅ 13.6 N

6 0
3 years ago
A dog jumps 0.80 m to catch a treat. The dog's displacement vector is shown below.
Brrunno [24]

Answer:D

Explanation:

It was right o khan academy

6 0
2 years ago
What are the dimensions of B
joja [24]
Well i think the answer is impossible to find because there is no picture
4 0
3 years ago
01:28:29
Novosadov [1.4K]

Answer:

an inverse relationship

7 0
3 years ago
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