Same current i = 2A is flowing in a wire frame as shown in figure. The frame is a combination of two equilateral triangles ACD and CDE of side 1m. It is placed in uniform magnetic field B = 4T acting perpendicular to the plane of frame. The magnitude of magnetic force acting on the frame is
|
(a) 24 N |
(b) Zero |
(c) 16 N |
(d) 8 N |
(a) 24 N
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In an isolated parallel plate capacitor of capacitance C, the four surface have charges 
and 
as shown. The potential difference between the plates is
|
(a) |
(b) |
(c) |
(d) |
Three resistances, each of 1 ohm, are joined in parallel. Three such combinations are put in series, then the resultant resistance will be
|
(a) 9 ohm |
(b) 3 ohm |
(c) 1 ohm |
(d) |
One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
|
(a) Mass of A and mass of B still remain equal |
|
(b) Mass of A increases |
|
(c) Mass of B decreases |
|
(d) Mass of B increases |
The maximum value of stopping potential in the following diagram is
|
(a) – 4V |
(b) – 1V |
(c) – 3V |
(d) – 2V |
