Electromagnetic Induction & Alternating Currents [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 42 - 46 of 215
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Question 42
Question MCQ▾
An inductive circuit contains resistance of 10Ω and an inductance of 20 H. If an ac voltage of 120 V and frequency 60 Hz is applied to this circuit, the current would be nearly
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.48 A | |
b. | 0.32 A | |
c. | 0.80 A | |
d. | 0.016 A |
Question 43
Question MCQ▾
The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milli-weber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is-
Choices
Choice (4) | Response | |
---|---|---|
a. | 31 mV | |
b. | 19 mV | |
c. | -6 mV | |
d. | -14 mV |
Question 44
Question MCQ▾
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 45
Question MCQ▾
A current of 10 A in the primary coil of a circuit is reduced to zero at a uniform rate in 10-3 second. If the coefficient of mutual inductance is 3H, the induced e. m. f. in the secondary coil will be,
Choices
Choice (4) | Response | |
---|---|---|
a. | 30 kV | |
b. | 2 kV | |
c. | 20kV | |
d. | 3 kV |
Question 46
Question Assertion-Reason▾
Assertion(Ꭺ)
An electric motor will have maximum efficiency when back e. m. f. is equal to half of the applied e. m. f.
Reason(Ꭱ)
Efficiency of electric motor depends only on magnitude of back e. m. f.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is false but Ꭱ is true | |
b. | Ꭺ is true but Ꭱ is false | |
c. | Both Ꭺ and Ꭱ are false | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |