Current Electricity — Physics STD 12 Science — Question

The expression for the capacity of the capacitor formed by compound dielectric placed between the plates of a parallel plate capacitor as shown in figure, will be (area of plate = A)

(a)

(b)

(c)

(d)

The correct curve between the magnetic induction (B) along the axis of a long solenoid due to current flow i in it and distance x from one end is

(a)

(b)

(c)

(d)

Force between the protons and neutrons in a nucleus is:

For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1,C = 0 then the logic states of output D are:

Four charges +Q, -Q, +Q, -Q  are placed at the corners of a square taken in order. At the centre of the square

(a) E = 0, V = 0

(b) E = 0, V ≠ 0

(c) E ≠ 0, V = 0

(d) E = 0, V ≠ 0

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is  at point A and p at point B. Then the difference between the resultant intensities at A and B is

(a) 2I

(b) 4I

(c) 5I

(d) 7I

Figure represents two simple harmonic motions. The parameter which has different values in the two motions is:

1. Amplitude.
2. Frequency.
3. Phase.
4. Maximum velocity.

The electric potential at a point on the axis of an electric dipole depends on the distance r of the point from the dipole as

(a) ∝

(b) ∝

(c) ∝ r

(d) ∝

Nuclear fusion reactions cannot be harnessed for productive applications because: