Electromagnetic Induction & Alternating Currents (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 30  32 of 124
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Question number: 30
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
If an alternating voltage is represented as E = 141 sin (628t), then
(1) The rms voltage is 141V
(2) The rms voltage is 100V
(3) The frequency is 50 Hz
(4) The frequency is 100 Hz
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  1 and 2 are correct 

c.  1 and 3 are correct 

d.  2 and 4 are correct 

Question number: 31
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
The r. m. s. value of an ac of 50 Hz is 10 A.
(1) Time taken by the alternating current in reaching from zero to maximum value is 5 x 10 ^{3} sec
(2) Time taken by the alternating current in reaching from zero to maximum value is 2 x 10 ^{3} sec
(3) The peak current is 14.14 A
(4) The peak current is 7.07 A
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  1 and 3 are correct 

c.  1 and 2 are correct 

d.  2 and 4 are correct 

Question number: 32
» Electromagnetic Induction & Alternating Currents » Faraday's Law
Question
A rectangular coil of size 10 cm x 20 cm has 60 turns. It is rotating about one of its diagonals in magnetic field 0.5 Wb/m ^{2} with a rate of 1800 revolution per minute. The induced e. m. f. in the coil can be,
(1) 111 V (2) 112 V
(3) 113 V (4) 114 V
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1 and 3 are correct 

c.  1, 2 and 3 are correct 

d.  1 and 2 are correct 
