It was later shown by Hartle and Hawking that these solutions can be "glued" together to construct multi-blackhole solutions of charged blackholes. These charged blackholes are in static equilibrium with each other with the gravitational and the electrostatic forces cancelling each other out. The Majumdar–Papapetrou solution, thus, can be seen as early example of BPS configuration where static equilibrium results due to the cancellation of opposing forces. Examples of such BPS configurations include cosmic strings (attractive gravitational force balances with the repulsive scalar force), monopoles, BPS configurations of D-branes (cancellation of NS-NS and RR forces, NS-NS being the gravitational force and RR being the generalisation of the electrostatic force), etc.