- AZero.
- BConstant.
- CPositive.
- DNegative.
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You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90º. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100 Ω. The difference of potential between two points separated by 50 cm on the wire will be
|
(a) 1 V |
(b) 1.5 V |
(c) 2 V |
(d) 3 V |
The variation of magnetic susceptibility (x) with temperature for a diamagnetic substance is best represented by
|
(a) |
(b) |
(c) |
(d) |
$1$
$2$
$\sqrt{2}$
$\frac{1}{\sqrt{2}}.$

Three charges 2q, -q, -q are located at the vertices of an equilateral triangle. At the centre of the triangle
|
(a) The field is zero but potential is non-zero |
(b) The field is non-zero but potential is zero |
|
(c) Both field and potential are zero |
(d) Both field and potential are non-zero |