Magnetic Effects of Electric Current

The video tutorial explains the magnetic effect of electric current, demonstrating how a current-carrying wire behaves like a magnet. It covers the creation and function of electromagnets, their applications in various fields, and the working principle of an electric bell. The tutorial includes experiments and activities to illustrate these concepts, emphasizing the advantages of electromagnets over permanent magnets.

What is the primary focus of the lesson on the magnetic effect of electric current?

• To explore the magnetic effect of electric current

• To understand the chemical properties of electricity

• To learn about the history of electricity

• To study the thermal effects of electric current

What happens to a compass needle when electric current flows through a nearby wire?

• It deflects from its north-south position

• It breaks

• It spins rapidly

• It remains stationary

What is the effect of electric current on a wire in terms of magnetism?

• It makes the wire brittle

• It changes the color of the wire

• It creates a magnetic field around the wire

• It heats up the wire

What is formed when a wire is wrapped around an iron nail and connected to a battery?

• A resistor

• A capacitor

• An electromagnet

• A permanent magnet

What happens to the pins when the current is switched off in the electromagnet activity?

• They start spinning

• They fall off the nail

• They become magnetized

• They remain attached to the nail

Which of the following is NOT an advantage of electromagnets over permanent magnets?

• They can be easily turned on and off

• Their strength can be controlled

• They are always stronger than permanent magnets

• They can be used in MRI machines

Which device uses electromagnets to lift heavy iron scraps?

• Electric bell

• Crane

• Loudspeaker

• Microphone

How does an electric bell produce sound?

• By using a piezoelectric crystal

• By vibrating a diaphragm

• By using an electromagnet to strike a gong

• By using a permanent magnet

What is the role of the iron strip in an electric bell?

• To strike the gong and produce sound

• To act as a permanent magnet

• To generate electricity

• To store electrical energy

What is the main principle behind the working of an electric bell?

• Magnetic effect of electric current

• Thermal effect of current

• Optical effect of current

• Chemical effect of current