A current of 2 amperes flowing through a conductor produces 80 joules of heat in ten seconds. The resistance of the conductor is:
0.5 Ω
2 Ω
4 Ω
20 Ω
A thermoelectric refrigerator works on
Joule effect
Seebeck effect
Peltier's effect
Thermionic effect
The potential difference between points A and B is:
20/7 V
40/7 V
10/7 V
zero
D.
zero
From the given figure, the current through the lower branch of resistances which are joined in series is
Again current through an upper branch of resistances which are also connected in series is
Now according to the Kirchhoff's voltage law
VB - VA = 8 × i2 - 4 × i1
A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror, what is the size of the image?
Two bulbs A and B are connected in parallel. Bulb A will glow more than bulb B. If their resistances are RA and RB respectively. Then :
RA RB
RA RB
RA RB
none of these
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