Self Induction

Practice Questions:

Question 1: easy

The self inductance of a toroid is :

1. \[\frac{\mu_{0}N^{2}r^{2}}{2R_{m}}\]

2. \[\frac{\mu_{0}N^{2}\pi r}{2R_{m}}\]

3. \[\frac{\mu_{0}N^{2}r}{2R_{m}}\]

4. \[\frac{\mu_{0}N^{2}r\pi}{2R_{m}}\]

View Answer

Question 2: easy

A coil resistance 20 Ω and inductance 5 H is connected with a 100 V battery. Energy stored in the coil will be :

1. 41.5 J

2. 62.50 J

3. 125 J

4. 250 J

View Answer

I = \frac{V}{R} = \frac{100}{20} = 5 \text{ A}

U = \frac{1}{2} L I^2 = \frac{1}{2} \times 5 \times 5^2 = 62.5 \text{ J}

Energy stored = 62.5 J

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