1
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 Gauss, in the next 5s, then induced EMF in the loop is : A
48 μV
B
28 μV
C
56 μV
D
36 μV
2
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
A planar loop of wire rotates in a uniform magnetic field. Initially at t = 0, the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of 10 s about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at :
A
2.5 s and 7.5 s
B
5.0 s and 10.0 s
C
5.0 s and 7.5 s
D
2.5 s and 5.0 s
3
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
Consider a circular coil of wire carrying constant current I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $$\phi$$i. The magnetic flux through the area of the circular coil area is given by $$\phi$$0. Which of the following option is correct?
A
$$\phi$$i = $$\phi$$0
B
$$\phi$$i < $$\phi$$0
C
$$\phi$$i $$>$$ $$\phi$$0
D
$$\phi$$i = - $$\phi$$0
4
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
A long solenoid of radius R carries a time (t) - dependent current
I(t)=I0t(1 - t). A ring of radius 2R is placed coaxially near its middle. During the time interval 0 $$\le$$ t $$\le$$ 1, the induced current (IR) and the induced EMF(VR) in the ring change as :
A
Direction of IR remains unchanged and VR is zero at t = 0.25
B
Direction of IR remains unchanged and VR is maximum at t = 0.5
C
At t = 0.25 direction of IR reverses and VR is maximum
D
At t = 0.5 direction of IR reverses and VR is zero
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