- A$∞$
- Bzero.
- CSmall but negative.
- DSmall but positive.
Explanation:
Diamagnetic sultance
$-1 ≤ χ<0$
$θ=μ<1$
$χ=$ susceptibility
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Symbolic representation of photodiode is
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(a) |
(b) |
(c) |
(d) |
For a normal eye, the least distance of distinct vision is
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(a) 0.25 m |
(b) 0.50 m |
(c) 25 m |
(d) Infinite |
A semiconductor dopped with a donor impurity is
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(a) P-type |
(b) N-type |
(c) NPN type |
(d) PNP type |
A very high magnetic field is applied to a stationary charge. Then the charge experiences
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(a) A force in the direction of magnetic field |
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(b) A force perpendicular to the magnetic field |
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(c) A force in an arbitrary direction |
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(d) No force |
A man standing in a swimming pool looks at a stone lying at the bottom. The depth of the swimming pool is h. At what distance from the surface of water is the image of the stone formed (Line of vision is normal; Refractive index of water is n)
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(a) h/n |
(b) n/h |
(c) h |
(d) hn |
Three wires of copper, iron and nickel are joined to form three junctions as shown in Fig. When the temperature of junction 1 is kept 50℃ with the other two junctions at 0℃, the sensitive galvanometer gives a deflection of 14 divisions. When the temperature of junction 3 is kept 50℃, with the other two junctions at 0℃, the galvanometer gives a deflection of 11 divisions. Then the deflection given by the galvanometer, when temperature of the junction 2 is kept at 50℃, with the other two junctions at 0℃, will be

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(a) 3 div |
(b) 11 div |
(c) 14 div |
(d) 25 div |
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 mT. What will be its value at the centre of the loop
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(a) 250 m T |
(b) 150 m T |
(c) 125 m T |
(d) 75 m T |
The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point

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(a) P |
(b) Q |
(c) R |
(d) S |