For a snapshot of typical insurance prices for 2016 under the health law, The Wall Street Journal examined choices for a midrange “silver” plan through HealthCare.gov for people who currently have coverage with the most popular insurer in their state. Premiums for plans that have been the most popular in each state are rising by double-digit percentages in 20 of the state capitals’ counties, and by more modest amounts in 10 others, the Journal found.