An electron revolves 6 × 1015 times/sec in circular loop. The current in the loop is
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(a) 0.96 mA |
(b) 0.96 m A |
(c) 28.8 A |
(d) None of these |
(a) 0.96 mA
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There is no couple acting when two bar magnets are placed coaxially separated by a distance because
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(a) There are no forces on the poles |
|
(b) The forces are parallel and their lines of action do not coincide |
|
(c) The forces are perpendicular to each other |
|
(d) The forces act along the same line |
A proton (or charged particle) moving with velocity v is acted upon by electric field E and magnetic field B. The proton will move undeflected if
|
(a) E is perpendicular to B |
|
(b) E is parallel to v and perpendicular to B |
|
(c) E, B and v are mutually perpendicular and |
|
(d) E and B both are parallel to v |
When NPN transistor is used as an amplifier
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(a) Electrons move from base to collector |
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(b) Holes move from emitter to base |
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(c) Electrons move from collector to base |
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(d) Holes move from base to emitter |
The logic behind ‘NOR’ gate is that it gives
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(a) High output when both the inputs are low |
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(b) Low output when both the inputs are low |
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(c) High output when both the inputs are high |
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(d) None of these |
A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is
|
(a) |
(b) |
(c) |
(d) Zero |
