Two charges each of equal magnitude 3.2 x 10-19 coulomb but of opposite sign form an electric dipole. The distance between the two charges is 2.4 . If the dipole is placed in an electric field of 5 x 105 volt/metre, then in equilibrium its potential energy will be
3 × 15-23 joule
-3.84 × 10-23 joule
-6 × 10-23 joule
-2 × 10-26 joule
A resistance of 8 ohm and an inductance of 6 ohm are connected in series to an A.C circuit. The impedence of the circuit is
14
10
2
15
A battery of 12 volt is charged by a supply of 100 volt as shown in the figure. The charging current is 1.0A. Calculate the value of R
45
105
88
95
At an instant a positive charge is moving parallel to a current carrying conductor. The path of the positive charge is
elliptical
circle
straight line
parabola
A current of 0.1 ampere is flowing through a coil of 1000 turns and radius 0.1 metre. The magnetic field at the centre of the coil is
2 × 10−1 T
4.31 × 10−2 T
6.28 × 10−4 T
9.81 × 10−4 T
At a certain place, magnitude of horizontal and vertical components of a magnetic field are same. The total intensity of magnetic field at that place will be
H
H2
2H
D.
Given:
H = V ...(i)
where, H = horizontal component of magnetic field
V = vertical component of magnetic fireld
Resultant intensity
I =
I =
I =
I = H
A coil having resistance of 50 ohm and an inductance of 10 ohm, is connected to a 100 volt battery. The energy stored in the coil is
10 J
20 J
30 J
40 J
A capacitor when charged by a potential difference of 200 volt, stores a charge of 0.1 C. By discharging, energy liberated by the capacitor is
-30 J
-15 J
10 J
20 J
A small current carrying loop acts as a small magnet. The area of the loop is A and magnetic moment is M. The current in the loop will be
MA
A2M