Electromagnetic Induction & Alternating Currents-Reactance and Impedance [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 6 - 10 of 14

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Question number: 6

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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Question

A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

Choices

Choice (4)Response

a.

16 volt

b.

10 volt

c.

6 volt

d.

8 volt

Question number: 7

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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Question

One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has self-inductance of value (f = 50Hz)

Choices

Choice (4)Response

a.

16.2 mH

b.

1.62 mH

c.

2.42 H

d.

0.052 H

Question number: 8

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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Question

A resistance of 300 Ω and an inductance of 1/π henry are connected in series to a ac voltage of 20 volt and 200 Hz frequency. The phase angle between the voltage and current is,

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 9

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

Energy stored in an inductor is proportional to (i= current in the inductor)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 10

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

An inductor (L = 100 mH), a resistor (R = 100Ω) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

Circuit diagram consist of inductor, resistor and battery

Circuit Diagram Consist of Inductor, Resistor and Battery

Choices

Choice (4)Response

a.

0.1 A

b.

c.

e A

d.

1 A

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