Would the bulb glow after completing the circuit shown in figure. If instead of safety pins we use an eraser?

Hint: Eraser is an insulator while safety pin is a conductor of electricity.

Complete step by step solution:
Safety pins are made up of metal, as metals are good conductors of electricity, so it will allow current to pass through them. On the other hand, an eraser is an insulator or bad conductor of electricity. Insulators do not allow electricity to pass through them.

Hence the bulb will not glow.

Additional Information:
Some materials allow electricity to pass through them easily. These materials are known as electrical conductors. Metals, such as copper, iron and steel are good conductors of electricity. These materials have low resistance to electric current. That is the reason that the parts of electrical appliances that need to let electricity to pass through them are always made of metal. Our body is also a good conductor of electricity, it allows electricity to pass through it. This is the reason why we experience electric shocks when we come in contact with the electric current. In a light bulb, the metal filament conducts electricity and causes the light bulb to glow.

Note: On the other hand, some materials do not allow electricity to pass through them. These materials are known as insulators. Plastic, wood, glass and rubber are insulators. These materials have high resistance to electric current. This is the reason why they are used to cover materials that carry electricity. The plastic covering that surrounds wires is an electrical insulator. It stops you from getting an electrical shock.