Show other category posts in single.php

List of post of a category can be show using wp_query like this

$paged = get_query_var('paged') ? get_query_var('paged') : 1;
$args = array(
        'post_type' => 'post',  //Specifying post type
        'posts_per_page' => 10, //How many posts per page
        'cat' =>'cat2',         //Specifying post category to show posts
        'paged' => $paged       //For pagingation (if required)
        );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
?>     
    <h3><?php the_title();?></h3>   
<?php 
endwhile; ?>