# A square loop of side $$1$$ m and resistance $$1$$ $$\Omega$$ is placed in a magnetic field of $$0.5$$ T. If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is: 1. $$0$$ 2.  $$2$$ weber 3.  $$0.5$$ weber 4.  $$1$$ weber

Subtopic: Â Magnetic Flux |
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NEET - 2022
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A big circular coil of $$1000$$ turns and average radius $$10~\text{m}$$  is rotating about its horizontal diameter at $$2~\text{rad s}^{-1}$$. If the vertical component of earth's magnetic field at that place is $$2\times 10^{-5}~\text{T}$$ and electrical resistance of the coil is $$12.56~\Omega,$$ then the maximum induced current in the coil will be:
1. $$2~\text{A}$$
2. $$0.25~\text{A}$$
3. $$1.5~\text{A}$$
4. $$1~\text{A}$$
Subtopic: Â Faraday's Law & Lenz Law |
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From NCERT
NEET - 2022
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The current in an inductor of self-inductance $$4~\mathrm{H}$$ changes from $$4~ \mathrm{A}$$ to $$2~\mathrm{A}$$ in $$1~ \mathrm s$$ . The emf induced in the coil is:
1. $$-2~\mathrm V$$
2. $$2~\mathrm V$$
3. $$-4~\mathrm V$$
4. $$8~\mathrm V$$

Subtopic: Â Self - Inductance |
Â 81%
From NCERT
NEET - 2022
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The dimensions of mutual inductance $$(M)$$ are:
1. $$[M^2LT^{-2}A^{-2}]$$
2. $$[MLT^{-2}A^{2}]$$
3. $$[M^{2}L^{2}T^{-2}A^{2}]$$
4. $$[ML^{2}T^{-2}A^{-2}]$$

Subtopic: Â Mutual Inductance |
Â 71%
From NCERT
NEET - 2022
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The magnetic field, through a closed loop of conducting wire covering an area of $$100$$ cm2, is $$5\times10^{-2}$$ T and it is uniform and normal to the area. If the field is switched off in a time of $$10$$ ms, the average emf induced is:
1. $$5$$ V
2. $$0.5$$ V
3. $$0.05$$ V
4. $$5\times10^{-4}$$ V
Subtopic: Â Faraday's Law & Lenz Law |
Â 78%
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A straight horizontal wire $$\mathrm{AB}$$ of length $$l$$ falls from rest under gravity. A uniform horizontal magnetic field $$B$$ acts perpendicular to the plane of motion of $$\mathrm{AB}$$, as shown. The induced emf across $$\mathrm{AB}$$, $$E$$, is proportional to:

1. $$B$$
2. $$l$$
3. time, $$t$$
4. all of the above
Subtopic: Â Motional emf |
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An $$L$$-shaped rod $$(ABC;AB=BC=a)$$ moves in its own plane with a velocity $$v$$ parallel to $$AB.$$ There is a uniform magnetic field $$B$$ acting into the plane as shown. The emf developed between $$A,C$$ is:

1. $$Bav$$
2. $$\sqrt2Bav$$
3. $$\frac{Bav}{2}$$
4. zero
Subtopic: Â Motional emf |
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A conducting circular wire of radius $$r$$ is moving with constant velocity $$v$$ towards the right in a uniform magnetic field $$B.$$ We consider two points $$X,Y$$ such that chord $$XY$$ is perpendicular to the velocity $$v$$ and is at a distance $$x$$ from the centre $$(O)$$ of the circle. The EMF induced between $$X,Y$$ is $$\varepsilon.$$ Then, $$\varepsilon$$ is proportional to:

1. $$x$$
2. $$\sqrt{r^2-x^2}$$
3. $$r$$
4. $$x\sqrt{r^2-x^2}$$
Subtopic: Â Motional emf |
Â 72%
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The self-inductance of a long solenoid of cross-section $$A,$$ total length $$L$$ and total number of turns $$N,$$ is (approximately):
1.  $$\frac{\mu_0A}{L}\cdot N$$
2.  $$\frac{\mu_0A}{L}\cdot N^2$$
3.  $$\frac{\mu_0L^3}{A}\cdot N$$
4.  $$\frac{\mu_0L^3}{A}\cdot N^2$$
Subtopic: Â Self - Inductance |
Â 78%
From NCERT
A straight horizontal wire of mass $$m$$ and length $$l,$$ and having a negligible resistance can slide freely on a pair of conducting parallel rails, placed vertically. The rails are connected at the top by a capacitor $$C.$$ A uniform magnetic field $$B$$ exists in the region, perpendicular to the plane of the rails. The wire
 1 falls with uniform velocity. 2 accelerates down with acceleration less than $$g$$. 3 accelerates down with acceleration equal to  $$g$$. 4 moves down and eventually comes to rest.