Two very thin metallic wires placed along X and Y-axis carry equal currents as shown here. AB and CD are lines at 45° with the axes with origin of axes at O. The magnetic field will be zero on the line
|
(a) AB |
(b) CD |
|
(c) Segment OB only of line AB |
(d) Segment OC only of line CD |
(a) AB
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If in the circuit, power dissipation is 150 W, then R is
|
(a) 2 W |
(b) 6 W |
(c) 5 W |
(d) 4 W |
A total charge Q is broken in two parts 
and 
and they are placed at a distance R from each other. The maximum force of repulsion between them will occur, when
|
(a) |
(b) |
|
(c) |
(d) |
Wavefront of a wave has direction with wave motion
|
(a) Parallel |
(b) Perpendicular |
(c) Opposite |
(d) At an angle of 𝜃 |
A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is
|
(a) 54 e.s.u. |
(b) |
(c) 30 e.s.u. |
(d) 36 e.s.u. |
Which is not true with respect to the cathode rays
|
(a) A stream of electrons |
(b) Charged particles |
|
(c) Move with speed same as that of light |
(d) Can be deflected by magnetic fields |
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power
|
(a) + 6.5D |
(b) – 6.5 D |
(c) + 7.5 D |
(d) – 0.75 D |
