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The energy stored in the magnetic field of solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current of 10 A is _____ J.
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- 5 joule
- 0.15 joule
- 15 joule
- All of the above
Correct Option: B
| ⇒ L = | = | 106 × 4μ × | × 10-4 | |||
| 4 | ||||||
| l | ||||||
| = | ||
| 0.3 |
∴ Energy stored with I = 10 A is
| = | Li2 | |
| 2 |
| = | = 0.148 or 0.15 Joules (nearly) | ||
| 2 | 0.3 |
