A 10 cm long solenoid has 100 turns. What will be the magnetic field inside it along its axis if one-microampere current is passed through it?
Correct answer: C. 4π x 10-10 tesla
- A. 4π x 10-13 tesla
- B. 4π x 10-17 tesla
- C. 4π x 10-10 tesla
- D. 4π x 10-16tesla
Explanation
Given that,Length = L= 10cm which is 0.1mNumber of turns = n = 100Current passed = 1μ which is 1 x 10-6AUsing the formula for magnetic induction,𝐵=𝜇0 n I / LWhere,𝜇0 is the magnetic permeability of free space, and mu naught value : µ0 = 4π × 10-7 H/m.n is the number of turns of wire per metreI is the current through the wireAnd L is its length,B=4π × 10-7 x 100 x 1 x 10-6/ 0.1B = 4π x 10-10tesla
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