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In a step-up transformer the turn ratio is 1:10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current
|
(a) 50 V, 1 amp |
(b) 10 V, 5 amp |
(c) 25 V, 4 amp |
(d) 20 V, 2 amp |
The lines of forces due to earth's horizontal component of magnetic field are
| (a) Parallel straight lines | (b) Concentric circles |
| (c) Elliptical | (d) Parabolic |
Which of the following has a negative temperature coefficient
|
(a) C |
(b) Fe |
(c) Mn |
(d) Ag |
Compton effect is associated with
| (a) α - rays | (b) β - rays | (c) X-rays | (d) Positive rays |
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
|
(a) 3 : 4 |
(b) 1 : 3 |
(c) 9 : 4 |
(d) None of these |
