Which is the correct diagram of a half-wave rectifier
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(a) |
(b) |
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(c) |
(d) |
Which is the correct diagram of a half-wave rectifier
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(a) |
(b) |
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(c) |
(d) |
(b)
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A uniform electric field pointing in positive x-direction exists in a region. Let A be the origin, B be the point on the x-axis at x = +1 cm and C be the point on the y-axis at y = +1 cm. Then the potentials at the points A, B and C satisfy
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(a) |
(b) |
(c) |
(d) |
Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
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(a) 4 |
(b) |
(c) 2 |
(d) |
The capacitance of a metallic sphere will be 1μF, if its radius is nearly
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(a) 9 km |
(b) 10 m |
(c) 1.11 m |
(d) 1.11 cm |
A solenoid is 1.0 metre long and it has 4250 turns. If a current of 5.0 ampere is flowing through it, what is the magnetic field at its centre [![]()
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(a) 5.4 |
(b) 2.7 |
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(c) 1.35 |
(d) 0.675 |
In the Wheatstone's bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be

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(a) From a to b |
(b) From b to a |
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(c) From b to a through c |
(d) From a to b through c |
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a nonreflecting surface is [c is the velocity of light]
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(a) Ic |
(b) |
(c) I/c |
(d) |
Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is flown
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(a) 1: |
(b) 1 : 2 |
(c) 2 : 1 |
(d) |
For protecting a sensitive equipment from the external magnetic field, it should be
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(a) Placed inside an aluminium cane |
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(b) Placed inside an iron cane |
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(c) Wrapped with insulation around it when passing current through it |
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(d) Surrounded with fine copper sheet |