- ACu.
- BConstantan.
- CTin-lead alloy.
- DNichrome.
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Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases
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(a) In P only |
(b) In P and Q only |
(c) In Q and R only |
(d) P and R only |
The unit of intensity of electric field is
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(a) Newton/Coulomb |
(b) Joule/Coulomb |
(c) Volt - metre |
(d) Newton/metre |
A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-sectional (A) will lead to the smallest resistance
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(a) L and A |
|
(b) 2L and A/2 |
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(c) L/2 and 2 A |
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(d) Any of the above, because volume of silver remains same |
Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (a is the width of the slit)
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(a) asinθ = |
(b) acosθ = |
(c) asinθ = |
(d) asinθ = |
If λ =10Å, then it corresponds to
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(a) Infra-red |
(b) Microwave |
(c) Ultra-violet |
(d) X-rays |
A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is: