Physicshard · Past Paper
A solenoid of length 0.5m has 500 turns. If 2A current flows, calculate the magnetic field strength (take μ₀ = 4π x 10^-7 T m/A).
A4π x 10^-4 T
B8π x 10^-4 T
C2π x 10^-4 T
D1.25 x 10^-3 T
✓ Correct Answer: B — 8π x 10^-4 T
B = μ₀ * (N/L) * I = (4π x 10^-7) * (500/0.5) * 2 = 4π * 10^-7 * 1000 * 2 = 8π * 10^-4 T.
Share this question
More from Physics
- A man of 60 kg climbs up 20 m. If he takes 10 seconds, what is his power? (g = 10 m/s^2)
- What is the rate of change of displacement called?
- What is the equivalent resistance between A and B in the provided circuit diagram?
- What is the angle between velocity and acceleration in a uniform circular motion?
- A stone is thrown vertically upward with a speed of 49 m/s. How much time does it take to reach maximum height? (g=9.8 m/s^2)