A current of 2 A is made to flow through a coil which has only one turn. The magnetic field produced at the centre is 4πx10⁻⁶ Wb/m². The radius of the coil is
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A metal rod of length l cuts across a uniform magnetic field B with a velocity v. If the resistance of the circuit of which the rod forms a part is r, then the force […]
Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively. If they enter a uniform magnetic field and move with the same velocity, then the ratio of their respective time periods […]
Time period of oscillation of a magnet is 2 sec. When it is remagnetised so that its pole strength is 4 times, its period will be
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(a) 4 sec (b) 2 sec […]
A proton and helium nucleus are shot into a magnetic field at right angles to the field with same kinetic energy. Then, the ratio of their radii is
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(a) (1:1) (b) (1:2) […]
If a proton, a deuteron and an alpha particle, on being accelerated by the same potential difference, enter perpendicularly to a magnetic field. The ratio of their respective kinetic energies is
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(a) […]
Which of the following, is a vector quantity?
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(a) Density (b) Magnetic flux (c) Intensity of magnetic field (d) Magnetic potential
Correct Answer:
Intensity of magnetic field
Explanation:
No explanation available. Be […]
The ferromagnetic substance is
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(a) Zn (b) Cu (c) Co (d) Al
Correct Answer:
Co
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
A wire of length L metre carrying a current I ampere is bent in the form of a circle. The magnitude of th magnetic moment is
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(a) L²I²/4π (b) LI/4π (c) L²I/4π […]
The ratio of magnetic dipole moment of an electron of charge e and mass m in Bohr’s orbit in hydrogen atom to its angular momentum is
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(a) e/m (b) m/e (c) 2m/e […]
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