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103.

When an infinite charged conducting plate is placed between two infinite conducting grounded surfaces as shown in the figure given below, what would be the ratio of the surface charge densities ρ₁ and ρ₂ on the two sides of the plate?

a. (d₁+t)/(d₂+t)
b. (d₂+t)/(d₁+t)
c. d₁/d₂
c. d₂/d₁

asked in Electrical Paper-1, 2007

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104.

A spherical balloon of radius a is charged. The energy density in the electric field at a point P shown in the figure given below is w. If the balloon is inflated to a radius b without altering its charge, what is the energy density at P?

a. w(b/a)³
b. w(b/a)²
c. w(b/a)
d. w

asked in Electrical Paper-1, 2007

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105.

A parallel plate air capacitor carries a charge Q at its maximum withstand voltage V. If the capacitor is half filled with an insulating slab of dielectric constant 4 as shown in the figure, what are the maximum withstand voltage and the charge on the capacitor at this voltage, respectively?

(a) 2.5 V, Q
(b) 4 V, 2.5 Q
(c) V, 2.5 Q
(d) V/4, Q

asked in Electrical Paper-1, 2007

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106.

If a very flexible wire is laid out in the shape of a hair-pin with its two ends secured, what shape will the wire tend to assume if a current is passed through it?
(a) Parabolic
(b) Straight line
(c) Circle
(d) Ellipse

asked in Electrical Paper-1, 2007

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107.

Fields are said to be circularly polarized if their magnitudes are
(a) equal and they are in phase
(b) equal and they differ in phase by ± 90°
(c) unequal and they differ in phase by ± 90°
(d) unequal and they are in phase

asked in Electrical Paper-1, 2007

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108.

Point charges of -10 nC and 10 nC are located in free space at (-1, 0, 0) m and (1,0,0) m respectively. What is the energy stored in the field?
(a) Zero
(b) 450 nJ
(c) -450 nJ
(d) -900 nJ

asked in Electrical Paper-1, 2007

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