A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be
|
(a) 4 Ω |
(b) 8 Ω |
(c) 0.25 Ω |
(d) 2 Ω |
(a) 4 Ω
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Which of the following shown particle nature of light
|
(a) Refraction |
(b) Interference |
(c) Polarization |
(d) Photoelectric effect |
When there is an electric current through a conducting wire along its length, then an electric field must exist
|
(a) Outside the wire but normal to it |
(b) Outside the wire but parallel to it |
|
(c) Inside the wire but parallel to it |
(d) Inside the wire but normal to it |
If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be
|
(a) Only inside the pipe |
(b) Only outside the pipe |
|
(c) Neither inside nor outside the pipe |
(d) Both inside and outside the pipe |
An ionization chamber with parallel conducting plates as anode and cathode has 5 
electrons and the same number of singly-charged positive ions per 
. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 
. The velocity of positive ions moving towards cathode is
|
(a) 0.4 m/s |
(b) 16 m/s |
(c) Zero |
(d) 0.1 m/s |