Match List-I with List-II.
| List - I | List -II | ||
|---|---|---|---|
| (A) | AC generator | (I) | Detects the presence of current in the circuit |
| (B) | Galvanometer | (II) | Converts mechanical energy into electrical energy |
| (C) | Transformer | (III) | Works on the principle of resonance in AC circuit |
| (D) | Metal detector | (IV) | Changes an alternating voltage for smaller or greater value |
Choose the correct answer from the options given below :
A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be :
If wattless current flows in the AC circuit, then the circuit is :
The electric field in an electromagnetic wave is given by E = 56.5 sin $$\omega$$(t $$-$$ x/c) NC$$-$$1. Find the intensity of the wave if it is propagating along x-axis in the free space.
(Given : $$\varepsilon $$0 = 8.85 $$\times$$ 10$$-$$12C2N$$-$$1m$$-$$2)
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