- ANever cross each other.
- BMay cross each other.
- CBoth a and b.
- DNone.
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Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is
|
(a) 10 ohm |
(b) 40 ohm |
(c) 20 ohm |
(d) 10/4 ohm |
The maximum current that flows through a fuse wire before it blows out varies with its radius as
|
(a) |
(b) r |
(c) |
(d) |
The focal length of a concave mirror is 50 cm. Where an object be placed so that its image is two times and inverted
|
(a) 75 cm |
(b) 72 cm |
(c) 63 cm |
(d) 50 cm |
Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is

|
(a) |
(b) |
(c) |
(d) |
A bar magnet is oscillating in the earth's magnetic field with time period T. If its mass is increased four times then its time period will be
|
(a) 4 T |
(b) 2T |
(c) T |
(d) T/2 |
A normal eye is not able to see objects closer than 25cm because:
A conducting sphere of radius R = 20 cm is given a charge Q = 16μC. What is
at centre
|
(a) 3.6 |
(b) 1.8 |
(c) Zero |
(d) 0.9 |