Question

2. Which of the following is not a source of
electric current?
(a) Battery
(b) Cell
(c) Conductor
(d) Mains
3. Which of the following materials is generally
used as the core of an electromagnet?
(a) Steel
(b) Iron
(c) Alnico
(d) Magnetite
4. Which of the following is not true of magnetic
lines of force?
(a) They do not intersect each other.
(b) They are continuous curves.
(c) They are crowded together where the
magnetic field is weak.
(d) They go from the north pole to the south
pole outside a magnet and from the south
pole to the north pole inside it.​

Answer 1

Answer:

2...because car batteries provide electricity to the cars,so it is a source of electricity and dry cells is a type of battery commonly used for portable electrical devices. It provide energy to many things which we daily use like TV remotes , rc cars , torches etc. But electromagnet does not provide us.

3....Soft iron is selected for making the core of an electromagnet because the core is used in a solenoid for the production of the strongest magnetism.

4....Outside the magnet, magnetic field lines go from south to north pole of the magnet is not the correct statement regarding magnetic field. Explanation: The two magnetic field lines never intersect each other.

Answer 2

Answer:

2. Option C is the correct answer.

Conductor is not a source of electric current.

Conductor is a device which allows the electric current to flow.

3. Option B is the correct answer.

Iron is generally used as the core of an electromagnet.

4. Option C is the correct answer.

The statement is incorrect because the magnetic lines of force are crowded together where the magnetic field is strong.