If r be the distance of a point on the axis of a magnetic dipole from its centre
If r be the distance of a point on the axis of a magnetic dipole from its centre then the magnetic field at such a point is proportional to
Options
(a) 1/r (b) 1/r² […]
Magnetic Effects of Current and Magnetism
The magnetic susceptibility does not depend upon the temperature in
The magnetic susceptibility does not depend upon the temperature in
Options
(a) Ferrite substances (b) Ferromagnetic substances (c) Diamagnetic substances (d) Paramagnetic substances
Correct Answer:
Diamagnetic substances
Explanation:
No explanation available. Be the […]
For a thermocouple, the neutral temperature is 270⁰C when its cold junction is at 20⁰C.
For a thermocouple, the neutral temperature is 270⁰C when its cold junction is at 20⁰C. What will be the neutral temperature and the temperature of inversion when the temperature of the cold junction is increased […]
The magnetic field at the centre of a circular coil carrying current I ampere is B.
The magnetic field at the centre of a circular coil carrying current I ampere is B. If the coil is bent into smaller circular coil of n turns, then its magnetic field at the centre […]
A proton is projected with a speed of 3×10⁶ m/s horizontally from east to west.
A proton is projected with a speed of 3×10⁶ m/s horizontally from east to west. An uniform magnetic field of strength 2×10⁻³ T exist in the vertically upward direction. What would be the acceleration of […]
An electron is moving in a circular path under the influence of a transverse magnetic
An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10⁻² T. If the value of e/m is 1.76×10¹¹ C/kg, the frequency of revolution of the electron is […]
Before using the tangent galvanometer, its coil is set in
Before using the tangent galvanometer, its coil is set in
Options
(a) Magnetic meridian (b) Perpendicular to magnetic meridian (c) At angle of 45⁰ to magnetic meridian (d) It does not require any […]
Tangent galvanometer is used to measure
Tangent galvanometer is used to measure
Options
(a) Current (b) Resistance (c) Charge (d) Potential difference
Correct Answer:
Current
Explanation:
No explanation available. Be the first to write the explanation for this question […]
If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio of their resistances will be
Options
(a) (3:2) (b) (2:3) (c) (3:4) (d) (4:3)
Correct Answer:
(3:2)
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction 1/π (Wb / m²) in such a way that its axis makes an angle of 60⁰ with B⃗. The […]