Magnetic field can be produced by any of the following methods: (i) Any magnet-bar magnet, horse-shoe magnet or round magnet can be used. (ii) A wire carrying current produces a field around it. (iii) A loop or solenoid carrying current.

If you push a magnet into a coil, as shown in Figure 11.25, you’ll feel a resistance to your push. Why is this resistance greater in a coil with more loops? law: The induced voltage in a coil is proportional to the number of loops, multiplied by the rate at which the magnetic field changes within those loops.

A current can be induced in a conducting loop if it is exposed to a changing magnetic field. A current can be induced in a conducting loop if it is exposed to a changing magnetic field.

Answer:

• By using a permanent magnet we can produce the magnetic field and it can be visualized by spreading iron fillings on a white paper and keeping a magnet beneath the paper.
• A current-carrying straight conductor produces the magnetic field.

Some of the methods of producing magnetic field are using permanent magnets, electromagnets and current carrying conductors.

A magnetic field can be created by running electricity through a wire. All magnetic fields are created by moving charged particles. Even the magnet on your fridge is magnetic because it contains electrons that are constantly moving around inside.

Yes. A magnetic field will produce eddy currents in a conductive (metal) projectile. It may not be a practical defense, but shooting a projectile through a 20 Tesla magnetic field will stop or melt or both a lead bullet a lot faster than people think.

What are the four things that are dependent on the size of an electromagnetic force? distance, magnitude, size of current, and whether the force is an attraction or repulsion.

The magnetic field generated is always perpendicular to the direction of the current and parallel to the solenoid. Hence if we reverse the current the direction of magnetic field also reverses.

Increasing the number of turns will increase the magnetic field.

As the number of turns increases the number of paper clips held increase. This means that the strength of the magnet increases with increasing number of turns in the coil. We can say that, the strength of the electromagnet is directly proportional to the number of turns in the coil.

The number of turns will have a direct effect on the coil’s d.c. resistance. A large resistance will decrease the current if the power supply is not changed.

The effect of an inductor in a circuit is to oppose changes in current through it by developing a voltage across it proportional to the rate of change of the current. An ideal inductor would offer no resistance to a constant direct current; however, only superconducting inductors have truly zero electrical resistance.

Number of Loops As the electrical current moves around the loops of the coil, it generates a magnetic field like that of a small bar magnet. The more loops you add, the stronger the field will become. The more loops you remove, the weaker the field will become.

When electricity is passed in a solenoid it makes an electromagnet. But the more current you want the solenoid has to have more coils have to be there. But we know that more coils increase resistance.