A long cylinder of uniform cross section and radius R is carrying a current i along its length and current density is uniform cross section and radius r in the cylinder parallel to its length. The axis of the cylinderical cavity is separated by a distance d from the axis of the cylinder. Find the magnetic field at the axis of cylinder.
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A cylindrical block of length 0.4 m and area of cross-section `0.04 m^2` is placed coaxially on a thin metal disc of mass 0.4 kg and of the same cross
Correct Answer - 1663.2s
2 Answers 2 views
A proton beam has a circular cross sectional area A and it carries a current I distributed uniformly over its cross section. Calculate the magnetic en
Correct Answer - `(mu_(0)I^(2))/(16pi)`
2 Answers 1 views
A long wire is along `x = 0, z = d` and carries current in positive y direction. Another wire is along `x = y, z = 0` and carries current in direction
Correct Answer - `(mu_(0)I)/(2pid) sqrt(5/4)+(1/sqrt(2))`
2 Answers 2 views
A tightly- wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surgace current through a width
Correct Answer - [(a) `(i)/(2n)`; (b) `(mu_(0)i)/(sqrt2)`]
2 Answers 1 views
A long thin wire is placed along the y-axis (just outside) of a frame of refernce. There exists a uniform magnetic field of `10^(-6)` T along the x-ax
Correct Answer - `2 xx 10^(-6)`T, `infity`, `sqrt(2) xx 10^(-6)`T, `2 xx 10^(-6)`T, `10^(-6)`T, `sqrt(2)xx 10^(-6)`T
2 Answers 1 views
A ring of radius R carries a charge q uniformly distribited over it. A long thin wire carrying charge `lambda`per unit length of it is held along its
Correct Answer - `F=(dlambda)/(4piepsilon_(0)R)`
2 Answers 2 views
A long cylinder of radius `a` carrying a uniform surface charge rotates about its axis with an angular velocity `omega`. Find the magnetic field energ
Correct Answer - `(mu_(0)lamda^(2)omega^(2)a^(2))/(8pi)`
2 Answers 1 views
A negligbly small current is passed through a wire of length 15 cm and uniform cross-section `6.0xx10^(-7) m^(2)` and its resistance is measured to be
Correct Answer - `2xx10^(-7) Omega m`
2 Answers 1 views
The wire of length L and resistance R is stretched so that its radius of cross-section is halved. What is its new resistance?
Correct answer is (D) 16R
2 Answers 1 views
DC current flows in a metal piece of non uniform cross-section. Which of these quantities remains constant along the conductor
Drift velocity and current density will change as it depends upon area of cross-section whereas current will remain constant.
2 Answers 2 views