- AMica
- BCopper
- CTin
- DIron
Explanation:
Here copper, tin, iron all are conductor so they will decrease the capacitance. The mica sheet is a dielectric or insulator so it will increase the capacitance k times. Where k is the dielectric constant.
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A dip needle lies initially in the magnetic meridian when it shows an angle of dip q at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip
. Then
is
|
(a) |
(b) |
(c) |
(d) cos x |
The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens:
X-rays were discovered by
| (a) Becquerel | (b) Roentgen | (c) Marie Curie | (d) Von Laue |
Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be
|
(a) Positively charged |
(b) Negatively charged |
(c) Neutral |
(d) Made of metal |
A point source of electromagnetic radiation has an average power output of 800 W. The maximum value of electric field at a distance 4.0 m from the source is
|
(a) 64.7 V/m |
(b) 57.8 V/m |
(c) 56.72 V/m |
(d) 54.77 V/m |
The specific charge of an electron is
|
(a) 1.6 |
(b) 4.8 |
|
(c) 1.76 |
(d) 1.76 |
In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is
|
(a) 0.5 Ω |
(b) 0.6 Ω |
(c) 1.2 Ω |
(d) 1.5 Ω |