Magnetic Effect of Electric Current

Q. Explain electromagnet with a diagram. [5 MARKS]

Q.

Magnetic field lines form closed loops.

1. True

2. False

Q.

Why Does The Conductor Refer To Valli As Madam

Q. An electromagnet is based on which of the following effects of electric current?

1. Chemical effect
2. Magnetic effect
3. Heating effect
4. Charging effect

Q. Which one of the following is not necessary to make an electromagnet?

1. Dry cell
2. Wires
3. Permanent magnet
4. Coil

Q.

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Q.

Write the full form of MIDI.

Q.

Which of the following effects electromagnets based on?

1. Heating effect of electric current

2. Electro-chemical effect of electric current

3. Magnetic effect of electric current

4. Chemical effect of electric current

Q.

On what principle does Electromagnet work?

Q.

Describe I-shaped electromagnets.

Q.

An electromagnet works based on the ___.

1. Heating effect of electric current

2. Electro-chemical effect of electric current

3. Magnetic effect of electric current

4. Chemical effect of electric current

Q.

Why does a compass have a lightweight magnet and a frictionless bearing?

1. To make it easier to carry

2. To allow the needle to turn easier

3. To make the compass more affordable

4. All of the above

Q.

A cycle dynamo works on the principle of

1. Chemical effects of current

2. Magnetic effects of current

3. Electromagnetic induction

4. Mechanical effects of current

Q.

In an electromagnet, insulated copper wire is wound around the core.

1. True
2. False

Q. 36 .​What is an electromagnet?
(i) What are the uses of electromagnet?
(ii) What are the advantages of electromagnet over permanent magnet.

Q.

The magnetic effect of electric current was first observed by _____________.

1. Isaac Newton

2. Galileo Galilei

3. W.H. Whitkar

4. H.C. Oersted

Q.

How electric field and magnetic field are formed in surroundings?

Q. The magnetic effects of electric current was first observed by .

Q. List fives uses of electromagnets.

Q.

Why is a freely suspended bar magnet always lie in the north-south direction?

Q. With increase in current, the strength of an electromagnet

1. Increases
2. Decreases
3. Remains same
4. Undetermined

Q.

What are magnetic lines

Q. When electric current flows through a wire, which field is set up around it?

1. Magnetic
2. Potential
3. Electric
4. Gravity

Q. In an electric bell, energy is the input and energy is the output.

Q. What is an electromagnet? Give two uses of electromagnets. Name two factors on which the strength of an electromagnet depends.

Q.

Which of the following is true about current carrying conductors?

1. They behave as magnets when current does not flow through them

2. They behave as magnets when current flows through them

3. They can never behave as a magnet

4. They are permanent magnets

Q. The magnetic field lines around a straight current carrying conductor are in form of concentric circles.

1. True
2. False

Q. Who among the following discovered the magnetic effect of electric current?

1. Oersted
2. Henry
3. Albert Einstein
4. Maxwell

Q. How is sound produced in a loudspeaker?​ [3 Marks]

Q.

How do you make an electromagnet?