suitors).  The banquet is involved as well and is just that:  a banquet.  There is even the entrance into the underworld, battle, and apotheosis.  Of course, Belinda is made immortal at the end with her "raped" lock hanging in the sky as either the moon or the stars.

As for the "artistic effect" that you are asked to relate.  The simple answer is that "describing trivial things in an elevated style" makes them seem more important than they really are which makes the reader focus on their apparent vanity and even silliness.  If you wish to take a more literary approach to this second question, then the "artistic effect" is one of satire, which is the "medium" of this art, that is to say it is the way Pope makes fun of this silly situation of the rich and their connection of chastity with locks of hair.  Note the grandiose language in the last stanza:

When those fair Suns shall sett, as sett they must,
And all those Tresses shall be laid in Dust;
This Lock, the Muse shall consecrate to Fame,
And mid'st the Stars inscribe Belinda's Name!

These words elevate Belinda to the status of the gods and goddesses.  She is now immortal because the "stars inscribe" her name.

As you have asked four actual questions here, and they are found two times on our eNotes website, I will attempt to answer the first two questions in the first answer with the second two in the second answer.

First, "In Canto 5, how did Belinda subdue the Baron and gain her revenge upon him?"  Although hidden within lofty language, the answer here is quite easy.  Let's look at the text:

Just where the Breath of Life his Nostrils drew,
A Charge of Snuff the wily Virgin threw;
The Gnomes direct, to ev'ry Atome just,
The pungent Grains of titillating Dust.
Sudden, with starting Tears each Eye o'erflows,
And the high Dome re-ecchoes to his Nose.

Belinda (and the goddesses) use the Baron's snuff to "subdue" the Baron.  In short, he takes such a sniff of his snuff at the wrong time and begins sneezing (and tearing) uncontrollably.  This is the inciting incident that makes Belinda's stolen lock fly high into the air, never to be grabbed (or raped) again. 

Second, again in Canto Five, there are two ideas about what happened to the lock.  First, many feel as though it is now housed on the moon (as it was seen to rise high into the air).  That is what the term "lunar sphere" means.  Note these lines of text:

Some thought it mounted to the Lunar Sphere,
Since all things lost on Earth, are treasur'd there.

Another idea put forth is that her lock made it further than the moon and is now a star in the night sky.  Note these lines of text:

But trust the Muse---she saw it upward rise,
Tho' mark'd by none but quick Poetic Eyes:
(So Rome's great Founder to the Heav'ns withdrew,
To Proculus alone confess'd in view.)
A sudden Star, it shot thro' liquid Air,
And drew behind a radiant Trail of Hair.

Further, because we are asked to "trust the Muse," my opinion is that the reader is supposed to think this precious lock has become a star with a "trail" behind it, ... possibly as beautiful as the Star of Bethlehem!  What a wonderful satire!

Belinda is presented by Pope in "The Rape of the Lock" as a bundle of contradictions. This makes her not just a more interesting character, but also a reflection of the society in which she lives. First and foremost, Belinda is a ravishingly beautiful young lady, her beauty a source of wonderment and admiration to men and women alike. Her very name comes from the Latin for "lovely to behold." Pope often describes Belinda in gushing superlatives such as "the brightest fair" and "the fairest of mortals."

Belinda is acutely aware of her extraordinary beauty and the equally extraordinary effect it has on people. She is the center of attention wherever she goes, most notably during her pleasure ride down the Thames, her bright smile and eyes shining like the sun:

Bright as the sun , her eyes the gazers strike ,
And, like the sun , she shines on all alike.

Not surprisingly, with all this natural beauty and the attention it brings, Belinda is a rather vain, superficial young lady. She worships at the feet of beauty, and, as she's the very embodiment of the that beauty, she worships herself as intently as everyone else does. Though self-assured, Belinda's value system seems more than a tad confused. She ostentatiously keeps a copy of the Bible on her dressing table along with all her powders, creams, and hairbrushes. It's as if Belinda treats the Word of God as just another fashion accessory, a means of showing off to people how devout she is. But placing a Bible next to a pile of love letters indicates just how shallow this attachment to religion really is.

Belinda's childishness, vanity, and superficiality come out even more strongly when the Baron relieves her of one of her pretty locks. Belinda lives by the code of beauty; her whole life is utterly devoted to it. Without her lovely lock of hair she feels no longer beautiful. It is then, however, that Belinda undergoes a stark transformation. In her implacable wrath and thirst for vengeance, she's no longer innocent; no longer a goddess walking upon the earth, but a real human being: fallen, vulnerable, and subject to the vicissitudes of everyday life.

Belinda is upper class, high-strung and conceited.  She is lovely and used to being told she is beautiful.  She is the type of girl one would expect to have "a favorite curl".   When she hears of the party where her curl will meet its doom, she is reluctant to go, but she can not stand not being there to be admired, so she goes anyway. 

She is used to being the center of attention.  She enjoys flirting, but until the Baron becomes one of her beaus, she never really entertains the idea of giving in to love and marriage.  Neglecting Ariel's (her fairy guardian in charge of her hair) advice to beware of all men, she plays cards flirtingly with two suitors, the Baron being one of them.  The Baron is aided by Clarissa, a jealous "friend" of Belinda's who slips him the scissors with which to steal the curl.

Belinda, usually well behaved as society girls are, flies into one of the most outrageous rages ever recorded.  She goes so far as to throw snuff in the Baron's face and to stab him with her hat pin.  Ouch! 

However much she rages, he at first will not return the lock of hair and then, having lost it, can not return it.  Belinda's usual vanity and pride return, however, when someone says she saw where the lock of hair went...it traveled to the stars and was made into a constellation where everyone for eternity can admire its beauty.

Within the context of the poem itself, Belinda is the only name given. But, Belinda the character is named for a real person: Arabella Fermor. "The Rape of the Lock" is a mock epic poem (or, as Pope refers to it, "an Heroi-Comical Poem"). The poem satirizes an actual account involving two aristocratic families. Pope's friend John Caryll suggested Pope write the mock epic to shed some levity on the quarrel that resulted from the event when Lord Petre cut a lock of hair from Arabella Fermor. The first few lines of the poem address Caryll and note that the poem is told in heroic/epic style but the subject matter is trivial or "slight":

I sing--This verse to Caryll, Muse! is due:
This, even Belinda may vouchsafe to view:
Slight is the subject, but not so the praise,
If she inspire, and he approve my lays. (3-6)

In the second edition of the poem, Pope added a letter addressed to Mrs. Arabella Fermor, detailing his reasons for writing the poem. "The human persons are as fictitious as the airy ones; and the character of Belinda, as it is now managed, resembles you in nothing but in beauty." 

I think the best way to characterize Belinda is to use the toilet scene.  The toilet scene is an incredibly high brow description of Belinda getting herself ready to go out.  

The first thing that I want to point out is that Belinda must be wealthy.  She has servants that help her do her hair and makeup.  That's not the norm.  It wasn't then, and it isn't now.  Having servants makes you wealthy.  

The busy Sylphs surround their darling Care;
These set the Head, and those divide the Hair,
Some fold the Sleeve, while others plait the Gown;
And Betty's prais'd for Labours not her own.

I've always thought that Belinda is incredibly vain as well.  I realize that women put on makeup to improve their looks.  That doesn't make all women vain. But Belinda is vain, because the beautification of herself is likened to a form of worship.  

A heav'nly Image in the Glass appears,
To that she bends, to that her Eyes she rears;
Th' inferior Priestess, at her Altar's side,
Trembling, begins the sacred Rites of Pride.

Self worship is essentially the definition of narcissism.  Honestly, if Pope was writing this poem today, he would have found a way to describe selfie pictures being taken of Belinda.  

I would also have to say that Belinda is quite sweet. . . while things are going her way.  But if things don't go according to plan, or somebody messes with her looks, watch out.  For example, she goes into crazy rage mode when Lord Petre cuts off one of her curls.  

Alexander Pope's The Rape of the Lock is a mock-epic which illustrates the importance of reason. Belinda's character illustrates the vanity of women, depicted through Belinda's obsession with her hair.

For some readers, Belinda may be seen as a despicable character. Ignoring very good advice, from Ariel, Belinda gets ready for an outing by spending much time on her hair and makeup. Belinda is depicted as a "heav'nly image." Refusing to pay attention to the warnings about men, jealousy, and vanity, Belinda does everything she can possibly do to make herself perfect. She seems far too concerned with her physical appearance. This is all compounded with Belinda's reaction to Lord Petre snipping off one of her curls. This attack on Petre only proves Belinda's vanity even more.

Other readers may find Belinda endearing. The fact that Ariel and sylphs are on the outing to protect Belinda from any harm (including the loss of her virginity), readers can picture Belinda as being something worth saving. Here, her "person" is not important; instead, it is her morality and virginity which are in need of protection. Since this seems to be something of the past (for modern readers), the maintaining of Belinda's purity can be seen as endearing.