In the given figure, when galvanometer shows no deflection, the current (in ampere) flowing through 5Ω resistance will be
|
(a) 0.5 |
(b) 0.6 |
(c) 0.9 |
(d) 1.5 |
(b) 0.6
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In a magnetic field of 0.05T, area of a coil changes from 
to 
without changing the resistance which is 2W. The amount of charge that flow during this period is
|
(a) 2.5 |
(b) 2 |
|
(c) |
(d) |
X-rays are produced by accelerating electrons by voltage V and let they strike a metal of atomic number Z. The highest frequency of X-rays produced is proportional to
|
(a) V |
(b) Z |
(c) (Z – 1) |
(d) |
The value of internal resistance of an ideal cell is
|
(a) Zero |
(b) 0.5 Ω |
(c) 1 Ω |
(d) Infinity |
The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
|
(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |
Two wires A and B of same material and same mass have radius 2rand r. If resistance of wire A is 34 Ω, then resistance of B will be
|
(a) 544 Ω |
(b) 272 Ω |
(c) 68 Ω |
(d) 17 Ω |
