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In a common base amplifier circuit, calculate the change in base current if that in the emitter current is 2 mA and a = 0.98
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(a) 0.04 mA |
(b) 1.96 mA |
(c) 0.98 mA |
(d) 2 mA |
Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents
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(a) Capacitance |
(b) Capacitive reactance |
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(c) Magnetic field between the plates |
(d) Energy stored in the capacitor |
Below figures (1) and (2) represent lines of force. Which is correct statement
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(a) Figure (1) represents magnetic lines of force |
|
(b) Figure (2) represents magnetic lines of force |
|
(c) Figure (1) represents electric lines of force |
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(d) Both figure (1) and figure (2) represent magnetic lines of force |
Two point charges Q and – 3Q are placed at some distance apart. If the electric field at the location of Q is E then at the locality of -3Q, it is
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(a) - E |
(b) E/3 |
(c) -3E |
(d) -E/3 |
What is the path difference of destructive interference
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(a) nl |
(b) n(λ + 1) |
(c) |
(d) |
Electric field and magnetic field in Thomson mass spectrograph are applied
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(a) Simultaneously, perpendicular |
(b) Perpendicular but not simultaneously |
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(c) Parallel but not simultaneously |
(d) Parallel simultaneously |
An interference pattern was made by using red light. If the red light changes with blue light, the fringes will become
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(a) Wider |
(b) Narrower |
(c) Fainter |
(d) Brighter |
