Electromagnetic Induction & Alternating Currents [JEE (Based on NTA Guidelines-IIT Engg.) Mains Physics]: Questions 1 - 4 of 172
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Question 1
Question MCQ▾
A square loop of side a is rotating about its diagonal with angular velocity ω in a perpendicular magnetic field as shown in the figure. If the number of turns in it is 10 then the magnetic flux linked with the loop at any instant will be-
Choices
Choice (4) | Response | |
---|---|---|
a. | 20Ba2 | |
b. | 10Ba2 cos (ωt) | |
c. | 10Ba | |
d. | 10Ba2 |
Question 2
Question MCQ▾
A loop of wire is placed in a magnetic field B = 0.02i T. Then the flux through the loop if its area vector is
Choices
Choice (4) | Response | |
---|---|---|
a. | 32 μ Wb | |
b. | 138 μ Wb | |
c. | 46 μ Wb | |
d. | 60 μ Wb |
Question 3
Question MCQ▾
The distance between the ends of wings of an airplane is 3m. This airplane is descending down with a speed of 300 km/hour. If the horizontal component of earth՚s magnetic field is 0.4 gauss then the value of e. m. f. induced in the wings of the plane will be –
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.1 V | |
b. | 1 V | |
c. | 2 V | |
d. | 0.01 V |
Question 4
Question MCQ▾
Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then
Choices
Choice (4) | Response | |
---|---|---|
a. | Current in each loop increases | |
b. | Current in each loop remains the same | |
c. | Current in each loop decreases | |
d. | Current in one-loop increases and in the other it decreases |