1
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
2
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
3
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
The figure shows a square loop L of side 5 cm which is connected to a network of resistances. The whole setup is moving towards right with a constant speed of 1 cm s-1. At some instant, a part of L is in a uniform magnetic field of 1 T, perpendicular to the plane of the loop. If the resistance of L is 1.7 $$\Omega$$, the current in the loop at that instant will be close to :
A
115 $$\mu$$A
B
170 $$\mu$$A
C
60 $$\mu$$A
D
150 $$\mu$$A
4
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
Two coils 'P' and 'Q' are separated by some distance. When a current of 3 A flows through coil 'P', a magnetic flux of 10–3 Wb passes through 'Q'. No current is passed through 'Q'. When no current passes through 'P' and a current of 2 A passes through 'Q', the flux through 'P' is :-
A
3.67 × 10–4 Wb
B
3.67 × 10–3 Wb
C
6.67 × 10–4 Wb
D
6.67 × 10–3 Wb
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