CBSE
The potential difference between points A and B is:
20/7 V
40/7 V
10/7 V
zero
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
If a current is flowing in a spring, then it:
compress
swing
expand
remain unaffected
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 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 thermoelectric refrigerator works on
Joule effect
Seebeck effect
Peltier's effect
Thermionic effect
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
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
Find the equivalent resistance between the points A and B :
2 Ω
4 Ω
8 Ω
16 Ω