Question:
A solenoid has 15 cm circumference and 70 turns/m carrying 2 A. Magnetic field inside and outside is:
A solenoid has 15 cm circumference and 70 turns/m carrying 2 A. Magnetic field inside and outside is:
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Magnetic field outside a long solenoid is negligible.
Updated On: Jun 17, 2026
- $0,\ 1.76\times10^{-4}T$
- $1.76\times10^{-4}T,\ 0$
- $8.8\times10^{-3}T,\ 0$
- $0,\ 8.8\times10^{-3}T$
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The Correct Option is B
Solution and Explanation
Step 1: Magnetic field inside long solenoid: \[ B = \mu_0 n I \]
Step 2: Substitute: \[ B = 4\pi \times 10^{-7} \times 70 \times 2 \]
Step 3: \[ B = 4\pi \times 140 \times 10^{-7} = 560\pi \times 10^{-7} \]
Step 4: \[ B \approx 1.76 \times 10^{-4}T \]
Step 5: Outside field of ideal solenoid ≈ 0.
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