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Two long parallel conducting horizontal rails are connected by a conducting wire at one end. A uniform magnetic field B (directed vertically downwards) exists in the region of space.

A light uniform ring of diameter d which is practically equal to separation between the rails is placed over the rails as shown in Fig. If resistance of ring be `(lambda)` per unit length
The force required to pull the ring with uniform velocity v is

A

The flux of electric field through the differential cube is zero

B

The flux of electric field through the cube = 12 dx dy dz

C

The charge enclosed by the cube is zero.

D

The charge enclosed by a spherical surface of radius r, centered at origin is `16 pi epsilon_(0)r^(3)`

Text Solution

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The correct Answer is:
B, D
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