Find the magnetic field at the centre. Radii of the circles are `R` and `2R` respectively. (A) `(mu_(0)I)/(2R)` perpendicularly outwards (B) `(mu_(0)I)/(4R)` perpendicularly inwards (C) `zero` (D) `(mu_(0))/(2R)` perpendicularly inwards

Find magnetic field at centre of hexagon wire of side a system carrying current 'I' at centre with 50 turn in multiple of \mu_0I/\(a pi)

The magnetic field at the origin due to a current element I vec(dl) placed at position r is (i) ((mu_(0)i)/(4pi))((dvec(l)xxvec(r))/(r^(3))) -((mu_(0)i)/(4pi))((dvec(l)xxvec(r))/(r^(3))) (iii) ((mu_(0)i)/(4pi))((vec(r)xxdvec(l))/(r^(3))) -((mu_(0)i)/(4pi))((vec(r)xxdvec(l))/(r^(3)))

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

If the equations of two circles, whose radii are r and R respectively, be S = 0 and S' = 0, then prove that the circles S/r+-(S')/R=0 will intersect orthogonally

Three concentric spherical conductors A, B, and C of radii r, 2R, and 4R, respectively. A and C is shorted and B is uniformly charged (charge +Q). Potential at B is

(A) : A magnetic field is produced either by a steady current or by a time varying electric field (R) : According to Ampere’s law ointbarB.bardl = mu_(0)i_(0)+mu_(0)epsilon_(0)(doint_(E ))/(dt)

Show that the magnetic field B at a point in between the plates of a parallel plate capacitor during charging is (mu_(0)epsilon_(0)r)/(2) (dE)/(dt) (symbols having usual meaing). ,

Which of the following can have negative value ? A. chi B. mu_(r) C. mu_(0) D. mu_(r) and chi both

For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its center is given by B=(mu_0IR^2N)/(2(x^2+R^2)^(3//2)) (a) Show that this reduces to the familiar result for field at the centre of the coil. (b) Consider two parallel coaxial circular coils of equal radius R, and number of turns N, carrying equal currents in the same direction, and separated by a distance R. Show that the field on the axis around the mid-point between the coils is uniform over a distance that is small as compared to R and is given by B=0*72(mu_0NI)/(R) approximately. [Such as arrangement to produce a nearly uniform magnetic field over a small region is known as Helmholtz coils.]

Due to the flow of current in a circular loop of radius R , the magnetic induction produced at the centre of the loop is B . The magnetic moment of the loop is ( mu_(0) =permeability constant)