Electromagnetic Induction & Alternating Currents (AIIMS (All India Institute of Medical Sciences) Physics): Questions 28  32 of 51
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Question number: 28
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Question
A capacitor of capacitance is connected in the tank circuit of an oscillator oscillating with a frequency of 2 kHz. If the current flowing in the circuit is 4 mA, the voltage across the capacitor will be –
Choices
Choice (4)  Response  

a.  0.18 V 

b.  142 V 

c.  0.21 V 

d.  60.0 V 

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Question number: 29
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Appeared in Year: 2005
Question
A 50 Hz a. c. source of 50 volts is connected across R and C as shown in figure below. The voltage across R is 20 volts. The voltage across C is –
Choices
Choice (4)  Response  

a.  46 V 

b.  90 V 

c.  25 V 

d.  9 V 

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Question number: 30
» Electromagnetic Induction & Alternating Currents » Induced EMF and Current
Question
A coil of copper having 1600 turns is placed in a magnetic field perpendicular to its plane. The cross sectional area of the coil is 0.07 m^{2}. If it turns through 180° in 0.04 sec, then the induced emf in the coil is –
Choices
Choice (4)  Response  

a.  22.4 V 

b.  2.24 V 

c.  0.224 V 

d.  224 V 

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Question number: 31
» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance
Question
The current passing through a choke coil of 9 H is decreasing at the rate of. The emf developing across the coil is –
Choices
Choice (4)  Response  

a.  27 V 

b.  27 V 

c.  3 V 

d.  – 3.0 V 

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Question number: 32
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
The reactance of an inductance of 0.05H for 100 Hz A. C. is –
Choices
Choice (4)  Response  

a.  31.4 Ω 

b.  6.28 Ω 

c.  3.14 Ω 

d.  62.8 Ω 

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