Q1 · medium · AI-verified
In a step-up transformer, if the primary has 100 turns and secondary has 500 turns, the voltage ratio (Vs/Vp) is:
- 1:5
- 5:1
- 1:1
- 2:1
Q2 · medium · AI-verified
A galvanometer can be converted into an ammeter by connecting:
- High resistance in series
- Low resistance in series
- High resistance in parallel
- Low resistance in parallel
Q3 · medium · AI-verified
Two point charges of +4 μC and -6 μC are placed 30 cm apart in air. What is the magnitude of electric force between them? (k = 9 × 10⁹ N·m²/C²)
- 1.8 N
- 7.2 N
- 2.4 N
- 3.6 N
Q4 · medium · AI-verified
In electromagnetic induction, the induced emf depends on:
- Rate of change of magnetic flux
- Magnitude of magnetic field only
- Area of the coil only
- Number of turns only
Q5 · medium · AI-verified
A solenoid has 1000 turns per meter and carries a current of 2 A. What is the magnetic field at the center of the solenoid? (μ₀ = 4π × 10⁻⁷ H/m)
- 2.51 × 10⁻³ T
- 5.03 × 10⁻³ T
- 7.54 × 10⁻³ T
- 1.26 × 10⁻³ T