- ANever cross each other.
- BMay cross each other.
- CBoth a and b.
- DNone.
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An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of
|
(a) 4R |
(b) R/4 |
(c) R/16 |
(d) 16R |
Consider a parallel plate capacitor of 10 μF (micro-farad) with air filled in the gap between the plates. Now one half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to
|
(a) 25 μF |
(b) 20 μF |
(c) 40 μF |
(d) 5 μF |
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
|
(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |