Quiz: Electricity, Magnetism and Induction There was an error trying to submit your form. Please try again. Static electricity is best described as: * The flow of electrons through a conductor The buildup of electric charge on the surface of an object Magnetism produced by a flowing current The flow of positive charges through a wire This field is required. When a balloon gains electrons after being rubbed on hair, the balloon becomes: * Positively charged Neutral Negatively charged Permanently magnetised This field is required. On a charged insulated body with a pointed part or corner, the charge: * Spreads evenly over the whole surface Moves to the flat area Concentrates at the pointed part or corner Disappears completely This field is required. The unit of electrical potential is the: * Ampere Ohm Coulomb Volt This field is required. By convention, electric current flows from: * Positive to negative, while electrons actually flow from negative to positive Negative to positive, the same direction as electrons Positive to negative, the same direction as electrons Negative to positive, while electrons flow from positive to negative This field is required. Which two factors are essential for the production of an electric current? * A permanent magnet and a soft iron core A potential difference and a conducting pathway between the two points An insulator and a neutral body High resistance and low temperature This field is required. According to Ohm's law, the current in a conductor is: * Directly proportional to resistance and inversely proportional to EMF Inversely proportional to both EMF and resistance Directly proportional to EMF and inversely proportional to resistance Independent of EMF and resistance This field is required. Three resistors R1, R2 and R3 are connected in series. The total resistance is: * R1 + R2 + R3 1/R1 + 1/R2 + 1/R3 The smallest of the three resistances R1 × R2 × R3 This field is required. When resistors are connected in parallel, which branch carries the least current? * The branch with the lowest resistance The branch with the highest resistance All branches carry equal current The first branch in the circuit This field is required. In a non-magnetised material, the molecular magnets are: * Arranged in a definite order, with all north poles at one end Absent from the material Arranged randomly, so their effects cancel out Aligned only at the surface This field is required. Why is soft iron used in transformers and other electrical equipment? * It becomes magnetised easily and loses its magnetism easily when the current is switched off It retains magnetism permanently It cannot be magnetised at all Its molecular magnets are held very tightly This field is required. Outside a magnet, magnetic lines of force: * Travel from south to north in straight lines Cross each other at the poles Travel from north to south, repel each other and follow curved paths Do not pass through metals This field is required. Which of the following is essential for electromagnetic induction? * A static conductor in a static magnetic field Relative movement between the conductor and the magnetic lines of force An insulating material around the magnet A direct current passing through a solid metal block This field is required. According to Lenz's law, the direction of the induced EMF is such that it: * Assists the force producing it Opposes the force producing it Is always from south to north Is unrelated to the direction of magnet movement This field is required. Eddy currents are: * Useful straight currents produced in coils Currents that flow only in insulators Unwanted circular currents produced in solid metal that heat up electrical equipment Currents produced only by permanent magnets at rest This field is required. Back Next Submit Quiz There was an error trying to submit your form. Please try again.Leave a ReplyYour email address will not be published. Required fields are marked *Comment * Name Email Website Δ
