1. Renewable Energy: Use of solar, wind, and hydroelectric power to reduce dependency on fossil fuels.
2. Water Conservation: Techniques like rainwater harvesting and efficient irrigation systems.
3. Waste Management: Recycling and composting to minimize landfill waste.
4. Green Building Design: Eco-friendly construction materials and energy-efficient designs.

Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)