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A resistance of 1980Ω is connected in series with a voltmeter, after which the scale division becomes 100 times larger. Find the resistance of voltmeter.
A proton, a deuteron and α particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circular paths.
A very long wire carrying a current i = 5.0 A is bent at right angles. Find the magnetic induction at a point lying on a perpendicular to the wires drawn through the point of bending, at a distance I = 35 cm from it.
Figure shows a rectangular current-carrying loop placed 2 cm away from a long, straight, current carrying conductor. What is the direction and magnitude of the net force acting on the loop?
Two semi infinitely long straight current carrying conductors are held in the form as shown in figure. One common end of them are at the origin. If both the conductors carry same current I, find the value of the magnetic field induction at a point (a, b).
A circular segment of radius 10 cm, subtends an angle of 60° at its centre. A current of 9 ampere is flowing through it. Find the magnitude and direction of the magnetic field produced at the centre.
An infinitely long conductor as shown in figure; carrying a current I with a semicircular loop on X-Y plane and two straight parts, one parallel to X-axis and another coinciding with z-axis. What is the magnetic field induction at the centre C of the semi-circular loop.
Find the magnetic induction at a point O if the wire carrying a current I = 8.0. A has a shape shown in figure. The radius of the curved part of the other wires is r = 100 mm and the linear parts of the wire are very long.
A cell is connected across two points P and Q of a uniform circular conductor. Prove that the magnetic field at its centre O will be zero.
Two wires A and B have the same length equal to 44 cm. and carry a current of 10A each. Wire A is bent into a bent into a circle and wire B is bent into a square.
(a) Which wire produces a greater magnetic field at the centre.
(b) Obtain the magnitudes of the fields at the centres of the two wires.