WP query categories?

<?php
$temp = $wp_query;
$wp_query= null;
$wp_query = new WP_Query();
$wp_query->query(‘&paged=’.$paged);
?>
<?php while ($wp_query->have_posts()) : $wp_query->the_post(); ?>

This is for home page right?
Now i want to implement this to categories in archive.php but i dont know how. When i enter code above to archive.php it shows home page posts (all posts) in every category.
How to make it work?