Hyundai Motor India Ltd., Bharat Heavy Electricals Ltd. and Delhivery Ltd. are among the companies that are set to announce their fourth-quarter results on Friday. Here's a look at the consensus ...

Make a simple mini-motor. A coil of wire becomes an electromagnet when current passes through it. The electromagnet interacts with a permanent magnet, causing the coil to spin. Voilà! You’ve created ...