Wavefront is the locus of all points, where the particles of the medium vibrate with the same
phase
amplitude
frequency
period
Two identical charged spheres of material density ρ, suspended from the same point by inextensible strings of equal length make an angle θ between the strings. When suspended in a liquid of density σ the angle θ remains the same. The dielectric constant K of the liquid is
The electric field at a point due to an electric dipole, on an axis inclined at an angle θ (< 90°) to the dipole axis, is perpendicular to the dipole axis, if the angle θ is
tan-1 (2)
In the circuit shown, the currents i1 and i2 are
i1 = 1.5 A, i2 = 0.5 A
i1 = 0.5 A, i2 = 1.5 A
i1 = 1 A, i2 = 3 A
i1 = 3 A, i2 = 1 A
In the given network, the valve of C, so that an equivalent capacitance between points A and B is 3 µF, is
48 μF
36 μF
A conductor wire having 1029 free electrons / m3 carries a current of 20A. If the cross-section of the wire is 1 mm2, then the drift velocity of electrons will be (e = 1.6 × 10-19 C)
1.25 × 10-4 ms-1
1.25 × 10-3 ms-1
1.25 × 10-5 ms-1
6.25 × 10-3 ms-1
A resistor has a colour code of green, blue, brown and silver. What is its resistance ?
56 Ω ± 5 %
560 Ω ± 10 %
560 Ω ± 5 %
5600 Ω ± 10 %
The voltage V and current I graph for a conductor at two different temperatures T1 and T2 and shown in the figure. The relation between T1 and T2 is
T1 > T2
T1 < T2
T1 = T2
A.
T1 > T2
Resistance = Slope of V-I graph
Resistance ∝ Temperature
R1 > R2
then T1 > T2
Consider the following statements regarding the network shown in the figure.
Which of the above statements is/are true ?
(1) alone
(2) alone
(2) and (3)
(1), (2) and (3)
The torque required to hold a small circular coil of 10 turns, area 1 mm2 and carrying a current of A in the middle of a long solenoid of 103 turns/m carrying a current of 2.5 A, with its axis perpendicular to the axis of the solenoid is
1.5 × 10-6 N-m
1.5 × 10-8 N-m
1.5 × 10+6 N-m
1.5 × 10+8 N-m