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प्रश्न
Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.
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उत्तर
The magnitude of e.m.f. induced in the secondary coil depends on the following two factors:
- The ratio of the number of turns in the secondary coil to the number of turns in the primary coil (i.e., turns ratio).
- The magnitude of e.m.f applied in the primary coil.
संबंधित प्रश्न
State the principle of the step-down transformer and its working.
Name the transformer used in the power transmitting station of a power plant.
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The following diagram in Fig. 10.44 shows a coil X connected to a sensitive centre –zero galvanometer G and a coil P connected to a battery through a switch S.

(a) Describe the observation when the switch S is (i) closed suddenly, (ii) then kept closed, (iii) finally opened.
(b) Name and state the law which explains the above observations.
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A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.
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How do the input and output powers in a transformer compare? State the assumption made.
