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Answers
Answer:
1.at the poles
2.electromagnetism
3.The flow of charge is the process of supplying or adding electric charge to an object or losing electric charge (mainly electrons) from an object
4.galvanometer
5.ampere
6.volt
7.i) when a voltage is connected across a wire
ii) metal wire
8.circuit
9. resistor
Explanation:
1) At the poles
The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
2) Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.
3) Electric current is the movement of electric charge through a conductive medium. We also use the term “current” as a quantity to describe the rate at which charge flows through a medium. The SI unit for current is the ampere (A), which is equal to a coulomb per second (C/s).
4) Galvanometer is an electromechanical device that is used to detect small electrical current. It points out the flow of current in a circuit through a pointer when electric current flows through a coil that is kept in a constant magnetic field.
5) ampere
Unit of electric current: ampere (A)
The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 ×10−19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ∆νCs
6) The SI unit of potential or potential difference is Volt. One Volt may be defined as the one joule of work-done to move a charge of one coulomb.
7) When a voltage is connected across a wire, an electric field is produced in the wire. Metal wire is a conductor . ... This causes a difference in energy across the component, which is known as an electrical potential difference (p.d.)
8) An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground".
9) We know that battery or cell is a source of electrical energy. Due to chemical reaction in this battery or cell, potential difference is generated. This potential difference causes electrons to flow through circuit. This circuit has resistors which resist flow of current.