Electricity & Magnetism MCQs with Answers

What is the magnetic field strength at a distance of 2 cm from a wire carrying a current of 5 A?

• A.1 × 10⁻⁴ T
• B.5 × 10⁻⁴ T
• C.2.5 × 10⁻⁵ T
• D.5 × 10⁻⁵ T

The force of attraction or repulsion between charged bodies is ?

• A.Directly proportional to the distance between them
• B.Inversely proportional to the square of distance between them
• C.Directly proportional to the square of distance between them
• D.Inversely proportional to the distance between them

Past Paper MCQ

Car batteries use that reacts with lead zirconate to generate electricity.

• A.Nitric acid
• B.Sulphuric acid
• C.Hydrochloric acid
• D.Phosphoric acid

may be used to reduce current flow, and, at the same time, may act to lower voltage levels within circuits.

• A.Capacitors
• B.Transistors
• C.Inductors
• D.Resistors

Why are commutators and brushes recommended for high DC voltage generators?

• A.To increase the speed of rotation
• B.To regulate the output voltage
• C.Produces spark
• D.To reduce mechanical friction

Transformer obeys the Law of Conservation of ?

• A.Power
• B.Energy
• C.Momentum
• D.Charge

Electric Flux Density is measured in what?

• A.Webers per square meter
• B.Volts per meter
• C.Coulombs per square meter
• D.Amperes per meter

Which of the following has the highest electrical conductivity?

• A.Aluminium
• B.Copper
• C.Gold
• D.Silver

Semiconductor works as ?

• A.Partially conductor and partially insulator
• B.Fully conductor
• C.Fully insulator
• D.None of these

In the case of a parallel plate capacitor, when the distance between the two plates is reduced to half and the area of the plates is doubled, the capacitance

• A.Increases four times
• B.Increases two times
• C.Remains the same
• D.Decreases to half