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If the strength of the magnetic field produced 10cm away from a infinitely long straight conductor is 
, the value of the current flowing in the conductor will be
|
(a) 5 ampere |
(b) 10 ampere |
(c) 500 ampere |
(d) 1000 ampere |
The relation between voltage sensitivity (
) and current sensitivity (
) of a moving coil galvanometer is (Resistance of Galvanometer = G)
|
(a) |
(b) |
(c) |
(d) |
What percentage of original radioactive atoms is left after five half lives
|
(a) 0.3% |
(b) 1% |
(c) 31% |
(d) 3.125% |
Suppose a planet goes around Sun with a linear speed twice as fast that of earth. What will be it's orbit size as compared to that of earth ? (Radius of earth = R)
|
(a) R / 4 |
(b) R / 2 |
(c) R |
(d) 2R |
In the adjoining figure, four capacitors are shown with their respective capacities and the P.D. applied. The charge and the P.D. across the 4μF capacitor will be
|
(a) 600 μC; 150 volts |
(b) 300 μC; 75 volts |
(c) 800 μC; 200 volts |
(d) 580 μC; 145 volts |
If the thermionic current density is J and emitter temperature is T then the curve between 
and 
will be
(a)
|
(b)
|
(c)
|
(d)
|
A particle of charge +q and mass m moving under the influence of a uniform electric field 
and a uniform magnetic field 
follows trajectory from P to Q as shown in figure. The velocities at P and Q are v
and -2v
respectively. Which of the following statement(s) is/are correct
|
(a) E = |
|
(b) Rate of work done by electric field at P is |
|
(c) Rate of work done by both the fields at Q is zero |
|
(d) a, b, c |
