Q1 · medium · AI-verified
Which rule is used to find the direction of the magnetic field around a straight current-carrying conductor?
- Right-hand thumb rule
- Fleming's left-hand rule
- Fleming's right-hand rule
- Lenz's Law
Q2 · medium · AI-verified
A galvanometer of resistance 100 Ω shows full-scale deflection for a current of 1 mA. What shunt resistance is needed to convert it into an ammeter measuring up to 100 mA?
- 0.1 Ω
- 1 Ω
- 100/99 Ω ≈ 1.01 Ω
- 99 Ω
Q3 · hard · AI-verified
A long straight conductor carrying current I is placed along the axis of a circular loop of radius R. The magnetic field at the centre of the loop due to the straight conductor is:
- Zero
- μ₀I / 2πR
- μ₀I / 2R
- μ₀I / 4πR
Q4 · medium · AI-verified
Two resistors of 4 Ω and 6 Ω are connected in parallel across a 12 V battery. What is the total current drawn from the battery?
- 3 A
- 2 A
- 4 A
- 5 A
Q5 · medium · AI-verified
The force experienced by a current-carrying conductor of length L carrying current I placed in a magnetic field B (perpendicular to the conductor) is:
- F = BI/L
- F = BIL
- F = BIL²
- F = B²IL