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
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
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 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 1/π (Wb / m²) in such a way that its axis makes an angle of 60⁰ with B⃗. The […]
A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will […]
A bar magnet having a magnetic moment of 2 x 10⁴JT⁻¹ is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 x 10⁻⁴T exists in the space. The work done […]
A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment µ is given by
Options
(a) qvR² (b) qvR² / 2 (c) […]
A closely wound solenoid of 2000 turns and area of cross-section 1.5 x 10⁻⁴ m² carries a current of 2.0 A. It suspended through its centre and perpendicular to its length, allowing it to turn […]
A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move
Options
(a) in […]
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