A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2W. Two resistance of 6W and 3W are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is
|
(a) 6 N |
(b) 4 N |
(c) 2 N |
(d) 1 N |
(c) 2 N
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Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits
|
(a) 0.12 mm |
(b) 0.3 mm |
(c) 3.0 mm |
(d) 4.0 mm |
$\text{v}\geq\text{v}_0$
$\text{v}>2\text{v}_0$
$\text{v}<\text{v}_0$
$\text{v}<\frac{\text{v}_0}{2}$
A 10 m long wire of 20W resistance is connected with a battery of 3 volt e.m.f. (negligible internal resistance) and a 10 W resistance is joined to it is series. Potential gradient along wire in volt per meter is
|
(a) 0.02 |
(b) 0.3 |
(c) 0.2 |
(d) 1.3 |
