Questions in Moving Charges and Magnetism

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	A length L of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
	A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is
	If a copper rod carries a direct current, the magnetic field associated with the current will be
	If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be
	The magnetic field $d\vec B$ due to a small current element $d\vec l$ at a distance $\vec r$ and element carrying current i is,
	A charge $q$ coulomb moves in a circle at $n$ revolutions per second and the radius of the circle is $r$ metre. Then magnetic field at the centre of the circle is
	An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of $i$ampere and the radius of the circular loop is $r$metre. Then the magnetic induction at its centre will be
	A current I ampere flows in a circular arc of wire whose radius is R, which subtend an angle $3\pi /2$ radian at its centre. The magnetic induction B at the centre is
	A current iampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance rmetre from the axis is
	A straight section PQ of a circuit lies along the X-axis from $x = - \frac{a}{2}$ to $x = \frac{a}{2}$ and carries a steady current i. The magnetic field due to the section PQ at a point X = + a will be

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