NEET 2013 (Karnataka) | Electromagnetic Induction and Alternating Current Question 38 | Physics

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively

20 V and 2.0 mA

10 V and 0.5 mA

Zero volt and therefore no current

20 V and 0.5 mA

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

0.5 Wb

12.5 Wb

zero

2 Wb

NEET 2013

MCQ (Single Correct Answer)

-1

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

four times per revoluation

six times per revolution

once per revolution

twice per revolution

NEET 2013

MCQ (Single Correct Answer)

-1

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when

a capacitance of reactance X_C = X_L is included in the same citcuit.

an iron rod is inserted in the coil.

frequency of the AC source is decreased.

number of turns in the coil is reduced.

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