**Answer:**

Matter made up of only one type of atom.

**Explanation:**

Please mark brainliest.

**Answer:**

**Explanation:**

As the two charges Q1 and Q2 are placed at some distance apart

so the electric field at mid point will be twice the electric field due to one charge

Because here the two charges are of opposite sign so here the electric field at mid point will be added due to both

so here we have

distance of mid point from one charge is given as

The mileage of the car how fast it is going

<span>A wire carrying electric current will produce a magnetic field with closed field lines surrounding the wire.Another version of the right hand rules can be used to determine the magnetic field direction from a current—point the thumb in the direction of the current, and the fingers curl in the direction of the magnetic field loops created by it. See.<span>The Biot-Savart Law can be used to determine the magnetic field strength from a current segment. For the simple case of an infinite straight current-carrying wire it is reduced to the form <span><span>B=<span><span><span>μ0</span>I</span><span>2πr</span></span></span><span>B=<span><span><span>μ0</span>I</span><span>2πr</span></span></span></span>.</span><span>A more fundamental law than the Biot-Savart law is Ampere ‘s Law, which relates magnetic field and current in a general way. It is written in integral form as <span><span>∮B⋅dl=<span>μ0</span><span>Ienc</span></span><span>∮B⋅dl=<span>μ0</span><span>Ienc</span></span></span>, where Ienc is the enclosed current and μ0 is a constant.</span><span>A current-carrying wire feels a force in the presence of an external magnetic field. It is found to be <span><span>F=Bilsinθ</span><span>F=Bilsinθ</span></span>, where ℓ is the length of the wire, i is the current, and θ is the angle between the current direction and the magnetic field.</span></span>Key Terms<span><span>**Biot-Savart Law**: An equation that describes the magnetic field generated by an electric current. It relates the magnetic field to the magnitude, direction, length, and proximity of the electric current. The law is valid in the magnetostatic approximation, and is consistent with both Ampère’s circuital law and Gauss’s law for magnetism.</span><span>**Ampere’s Law**: An equation that relates magnetic fields to electric currents that produce them. Using Ampere’s law, one can determine the magnetic field associated with a given current or current associated with a given magnetic field, providing there is no time changing electric field present.</span></span>

Power cords are conductors and are covered by insulators. If they were not, then it would be easy to create a short-circuit. It would also be not safe, as a person touching the bare wires would be electricuted.