Electricity & Magnetism MCQs with Answers

Which of the following best describes magnetic force?

• A.Attractive force only
• B.Gravitational force
• C.Deflecting force
• D.Contact force

Which one of the following is not a unit of magnetic induction?

• A.Tesla
• B.Gauss
• C.Weber
• D.None of these

Which of the following will be attracted to the magnet?

• A.A plastic comb
• B.A copper wire
• C.An iron kettle
• D.A wooden spoon

The resistivity ρ of copper in Ω m is ?

• A.9.71 × 10⁻⁸
• B.2.82 × 10⁻⁸
• C.5.60 × 10⁻⁸
• D.1.68 × 10⁻⁸

During a thunderstorm, what is the charge of the Earth?

• A.Positive
• B.Negative
• C.Neutral
• D.Alternating

Four resistors, each with a value of 68 Ohms, are connected in parallel across a 220 V source. What is the total current (I)?

• A.12.94 A
• B.3.24 A
• C.6.47 A
• D.1.62 A

The point where the electric field is zero between two opposite charges lies ?

• A.Closer to the positive charge
• B.Closer to the negative charge
• C.At the midpoint between them
• D.Nowhere between them

The emf induced in a closed circuit is directly proportional to the rate of change of magnetic flux passing through the circuit refers to ?

• A.Faraday's law of electromagnetic induction
• B.Lenz's law
• C.Ampere's law
• D.Ohm's law

The direction of the induced emf is readily predicted by _?

• A.Faraday's Law
• B.Lenz's Law
• C.Ohm's Law
• D.Coulomb's Law

Two point charges, +5µC and -5µC are placed at points A and B, respectively, which are separated by a distance 2d. What is the electric potential at the midpoint M of the line joining A and B?

• A.Zero
• B.Positive
• C.Negative
• D.Cannot be determined