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Rzqust [24]
3 years ago
15

1).which of the following describes the interaction between a south pole and a north pole of a magnet

Physics
1 answer:
kumpel [21]3 years ago
6 0

1) a) attract

The magnetic force between two magnetic poles is attractive for two unlike poles and repulsive for two like poles. Therefore we have:

1- For two north poles, the force between them is repulsive

2- For two south poles, the force between them is repulsive

3- For a north pole and a south pole, the force between them is attractive

In this problem, we are in the situation described in 3), so the force between the poles is attractive.

2) a) motion of electrons

While electric fields are produced by static electric charges, magnetic fields are produced by charges in motion (currents). In particular, a current in a wire (where a current is simply the motion of electrons inside the wire) produces a magnetic field whose intensity is

B=\frac{\mu_0 I}{2 \pi r}

where

I is the current in the wire

r is the radial distance from the wire

And the direction of the field lines are such that the field form concentric circles around the wire.

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Potential energy =

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                         (25kg) x (9.8 m/s²) x (30 meters)

                     =  (25 x 9.8 x 30)  kg-m²/s²

                     =        7,350 joules .

Kinetic energy = (1/2) x (mass) x (speed²)

The rock's kinetic energy at the bottom is
the same as its potential energy at the top.

                                        7,350 joules = (1/2) x (25 kg) x (speed²)

Divide each side
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                                 7,350 kg-m²/s² / 12.5kg  =  speed²

                                 (7,350 / 12.5)  m²/s²  =  speed²

                                      588 m²/s²  =  speed²
Take the square root
of each side:            
                                   Speed = √(588 m²/s²) 

                                             =  24.248... m/s       (rounded)

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