Explanation:
$\text{K}=\frac{1}{4\pi\in_\circ\text{k}}$ and its units is N−m2/ C2
It depend on system of unit and dielectric constant (k), that's medium between charges
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An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of
|
(a) 20 amp |
(b) 5 amp |
(c) 15 amp |
(d) 10 amp |
Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is R, then the effective resistance between the two diagonal ends would be
|
(a) 2 R |
(b) 12 R |
(c) |
(d) 8 R |
Two point charges of 20μC and 80 μC are 10 cm apart. Where will the electric field strength be zero on the line joining the charges from 20 μC charge
|
(a) 0.1 m |
(b) 0.04 m |
(c) 0.033 m |
(d) 0.33 m |
An electron and a proton are in a uniform electric field, the ratio of their accelerations will be
|
(a) Zero |
|
(b) Unity |
|
(c) The ratio of the masses of proton and electron |
|
(d) The ratio of the masses of electron and proton |
