Question 8: To determine which electromagnet will attract more pins, we need to consider the factors that affect the strength of an electromagnet. The strength of an electromagnet depends on the number of turns of wire and the type of core material used. In this case, Boojho wound 50 turns of wire and Paheli wound 100 turns of wire over similar iron screws.

The number of turns of wire directly affects the strength of the electromagnet. More turns of wire create a stronger magnetic field, which results in a greater attraction force. Therefore, Paheli's electromagnet with 100 turns of wire will attract more pins compared to Boojho's electromagnet with 50 turns of wire.

Question 9: Yes, electric current has effects other than heating. One such effect is the production of a magnetic field. When an electric current flows through a wire, it creates a magnetic field around the wire. This property is utilized in electromagnets and electric motors.

(a) Copper and aluminium wires are commonly used for electricity transmission due to their low electrical resistance. Both copper and aluminium have high electrical conductivity, which means they allow electric current to flow easily through them. This reduces the energy loss during transmission and ensures efficient delivery of electricity.

(b) The resistance of a wire is directly proportional to its length. As the length of a wire increases, the resistance also increases. This is because a longer wire offers more obstacles for the flow of electric current, resulting in a higher resistance. Conversely, a shorter wire has fewer obstacles and therefore has lower resistance.

(c) Tungsten is used almost exclusively for the filament of an electric lamp due to its high melting point and resistance to heat. When an electric current passes through the filament, it heats up and emits light. Tungsten has a very high melting point, allowing it to withstand the high temperatures generated by the electric current without melting or deforming. This makes tungsten ideal for use in electric lamp filaments.

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Question 8: To determine which electromagnet will attract more pins, we need to consider the factors that affect the strength of an electromagnet. The strength of an electromagnet depends on the number of turns of wire and the type of core material used. In this case, Boojho wound 50 turns of wire and Paheli wound 100 turns of wire over similar iron screws.

The number of turns of wire directly affects the strength of the electromagnet. More turns of wire create a stronger magnetic field, which results in a greater attraction force. Therefore, Paheli's electromagnet with 100 turns of wire will attract more pins compared to Boojho's electromagnet with 50 turns of wire.

Question 9: Yes, electric current has effects other than heating. One such effect is the production of a magnetic field. When an electric current flows through a wire, it creates a magnetic field around the wire. This property is utilized in electromagnets and electric motors.

(a) Copper and aluminium wires are commonly used for electricity transmission due to their low electrical resistance. Both copper and aluminium have high electrical conductivity, which means they allow electric current to flow easily through them. This reduces the energy loss during transmission and ensures efficient delivery of electricity.

(b) The resistance of a wire is directly proportional to its length. As the length of a wire increases, the resistance also increases. This is because a longer wire offers more obstacles for the flow of electric current, resulting in a higher resistance. Conversely, a shorter wire has fewer obstacles and therefore has lower resistance.

(c) Tungsten is used almost exclusively for the filament of an electric lamp due to its high melting point and resistance to heat. When an electric current passes through the filament, it heats up and emits light. Tungsten has a very high melting point, allowing it to withstand the high temperatures generated by the electric current without melting or deforming. This makes tungsten ideal for use in electric lamp filaments.

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Question 8: To determine which electromagnet will attract more pins, we need to consider the factors that affect the strength of an electromagnet. The strength of an electromagnet depends on the number of turns of wire and the type of core material used. In this case, Boojho wound 50 turns of wire and Paheli wound 100 turns of wire over similar iron screws.

The number of turns of wire directly affects the strength of the electromagnet. More turns of wire create a stronger magnetic field, which results in a greater attraction force. Therefore, Paheli's electromagnet with 100 turns of wire will attract more pins compared to Boojho's electromagnet with 50 turns of wire.

Question 9: Yes, electric current has effects other than heating. One such effect is the production of a magnetic field. When an electric current flows through a wire, it creates a magnetic field around the wire. This property is utilized in electromagnets and electric motors.

(a) Copper and aluminium wires are commonly used for electricity transmission due to their low electrical resistance. Both copper and aluminium have high electrical conductivity, which means they allow electric current to flow easily through them. This reduces the energy loss during transmission and ensures efficient delivery of electricity.

(b) The resistance of a wire is directly proportional to its length. As the length of a wire increases, the resistance also increases. This is because a longer wire offers more obstacles for the flow of electric current, resulting in a higher resistance. Conversely, a shorter wire has fewer obstacles and therefore has lower resistance.

(c) Tungsten is used almost exclusively for the filament of an electric lamp due to its high melting point and resistance to heat. When an electric current passes through the filament, it heats up and emits light. Tungsten has a very high melting point, allowing it to withstand the high temperatures generated by the electric current without melting or deforming. This makes tungsten ideal for use in electric lamp filaments.

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