Circulation of Magnetic Field

Q. A current I flows along the length of an infinitely long, straight and thin-walled pipe. Choose the correct option?

1. The magnetic field at all points inside the pipe is the same but not zero
2. The magnetic field at any point inside the pipe is zero
3. The magnetic field is zero only on the axis of the pipe
4. The magnetic field is different at different points inside the pipe

Q.

A current of I ampere flows along an infinitely long straight thin walled hollow metallic cylinder of radius r. The magnetic field at any point outside the cylinder at a distance x form the axis is

1. $\frac{{\mu }_{0}I}{2\mu r}$

2. $\frac{{\mu }_{0}I}{2\pi (x-r)}$

3. $\frac{{\mu }_{0}I}{2\pi r^2}$

4. $\frac{{\mu }_{0}I}{2\mu (x-r{)}^2}$

Q.

A solid metallic cylinder carries a direct current. The magnetic field produced by it exists

1. Outside the cylinder only

2. Inside the cylinder only

3. Both inside and outside the cylinder

4. Neither inside nor outside the cylinder

Q. While talking about direction of current, dot symbol represents current coming out of a plane while a cross symbol represents current going into the plane.

1. False
2. True

Q.

A current of I ampere flows along an infinitely long straight thin walled hollow metallic cylinder of radius r. The magnetic field at any point outside the cylinder at a distance x form the axis is

1. $\frac{{\mu }_{0}I}{2\mu r}$

2. $\frac{{\mu }_{0}I}{2\pi (x-r)}$

3. $\frac{{\mu }_{0}I}{2\pi r^2}$

4. $\frac{{\mu }_{0}I}{2\mu (x-r{)}^2}$

Q. Electrial flux depicts the area integral of electrical field while magnetic field circulation depicts line integral of magnetic field.

1. True
2. False