Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ . When the currents are in the same direction, then the magnetic field midway between the wires is 10μT. When the direction […]
If a steel wire of length l and magnetic moment M is bent into a semicircular arc, then the new magnetic moment is
Options
(a) Mxl (b) M/l (c) 2M/π (d) M
Correct […]
A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length in a homegeneous magnetic field of 0.5 T. If the ends of the wire are joined to […]
If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie wavelength of the incident electrons to the shortest wavelength X-ray produced? (e/m for electron =1.8×10¹¹ C kg⁻¹)
Options […]
The rms current in an AC circuit is 2 A. If the wattless current be √3 A, what is the power factor of the circuit?
Options
(a) (1/2) (b) (1/3) (c) 1/√3 (d) 1/√2
A current I ampere flows along the inner conductor of a co-axial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance […]
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