- AComb rubbed with hair attracts paper bits.
- BA blanket in winters in dark when scrambled gives electrical sparks.
- CTwo people shaking hands feel a small spark in winters.
- DHeat is generated in a resistor carrying current.
Explanation:
(d) is based on Joule's Law.
Rest are electrostatic phenomenon.
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In Young’s experiment, monochromatic light is used to illuminate the two slits A and B. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit
|
(a) The fringes will disappear |
|
(b) The fringe width will increase |
|
(c) The fringe width will increase |
|
(d) There will be no change in the fringe width but the pattern shifts |
Resistance of tungsten wire at 150℃ is 133 Ω . Its resistance temperature coefficient is 0.0045/℃. The resistance of this wire at 500 ℃ will be
|
(a) 180 Ω |
(b) 225 Ω |
(c) 258 Ω |
(d) 317 Ω |
$\mu<\mu',\text{M < M}'$
$\mu>\mu',\text{M < M}'$
$\mu<\mu',\text{M > M}'$
$\mu>\mu',\text{M > M}'$
If in the circuit shown below, the internal resistance of the battery is 1.5 W and VP and VQ are the potentials at P and Q respectively, what is the potential difference between the points P and Q
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(a) Zero |
(b) 4 volts (VP > VQ) |
(c) 4 volts (VQ > VP) |
(d) 2.5 volts (VQ > VP) |
Equivalent resistance between the points A and B is (in W)
|
(a) |
(b) 1 |
(c) 2 |
(d) 3 |
