The current in a triode at anode potential 100 V and grid potential – 1.2 V is 7.5 mA. If grid potential is changed to – 2.2 V, the current becomes 5.5 mA. the value of trans conductance (gm) will be
|
(a) 2 mili mho |
(b) 3 mili mho |
(c) 4 mili mho |
(d) 0.2 mili mho |
(a) 2 mili mho
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The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately
|
(a) 0.230 per minute |
(b) 0.461 per minute |
|
(c) 0.691 per minute |
(d) 0.922 per minute |
A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
|
(a) M/A |
(b) AIM |
(c) MA |
(d) |
