A circular coil with a
cross-sectional area of 4 cm2 has 10 turns. It is placed at the
centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10
cm2. The axis of the coil coincides with the axis of the solenoid.
What is their mutual inductance?
The BH curve for a ferromagneticmaterial
is shown in the figure. The material is placed inside a long solenoid which
contains 1000 turns/ cm. The current that should be passed in the solenonid to
demagnetize the ferromagnet completely is
Two wires of A and B with
circular cross section made up of the same material with equal lengths. Suppose
RA = 3 RB, then what is the ratio of radius of wire A to
that of B?
Two identical point charges
of magnitude –q are fixed as shown in the figure below. A third charge +q is
placed midway between the two charges at the point P. Suppose this charge +q is
displaced a small distance from the point P in the directions indicated by the
arrows, in which direction(s) will +q be stable with respect to the
displacement?
A. A1 and A2
B. B1 and B2
C. both directions
D. No stable
Answer : Option BExplaination / Solution: Hint: Since V=0 along equatorial line
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water of the jet. What is the rate at which kinetic energy is imparted to water ?.
A. ½ mv2
B. mv2
C. ½ mu2
D. mu2
Answer : Option AExplaination / Solution: No Explaination.
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