- AElectrical energy to mechanical energy.
- BHeat energy to electrical energy.
- CHeat energy to light energy.
- DMechanical energy to electrical energy.
Explanation:
An AC generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
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The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.
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|
(a) 8 min 20 s |
(b) 6 min 2 s |
(c) 7 min |
(d) 14 min |
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(a) Speed |
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(c) Frequency |
(d) Wavelength |
A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 × 10–4 T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is
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(a) 10–4 |
(b) 3 × 10–4 |
(c) 5 × 10–4 |
(d) 6 × 10–4 |
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(a) |
(b) |
(c) |
(d) |