A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct ?

• The particle is moving and magnetic field is perpendicular to the velocity

• The particle is moving and magnetic field is parallel to the velocity

• The particle is stationary and magnetic field is perpendicular

• The particle is stationary and magnetic field is parallel

If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle ?

• Circular

• Elliptical

• Linear

• Helical

A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid ?

• 6.28 × 10^-4 T

• 6.28 × 10^-3 T

• 6.28 × 10^-7 T

• 6.28 × 10^-6 T

A gyromagnetic ratio of the electron revolving in a circular orbit of hydrogen atom is 8.8 × 10¹⁰ C kg^-1. What is the mass of the electron ? Given, charge of the electron = 1.6 x 10^-19 C.

• 1 x 10^-29 kg

• 0.1 x 10^-29 kg

• 1.1 x 10^-29 kg

• 1/11 x 10^-29 kg

What is the value of shunt resistance required to convert a galvanometer of resistance 100 Ω into an ammeter of range 1 A ?

Given, full scale deflection of the galvanometer is 5 mA.

• $\frac{5}{9.95} \mathrm{\Omega }$

• $\frac{9.95}{5} \mathrm{\Omega }$

• 0.5 Ω

• 0.05 Ω

A circular coil of radius 10 cm and 100 turns carries a current 1 A. What is the magnetic moment of the coil ?

• 3.142 × 10⁴ Am²

• 10⁴ Am²

• 3.142 Am²

• 3 Am²

A susceptibility of a certain magnetic material is 400. What is the class of the magnetic material ?

• Diamagnetic

• Paramagnetic

• Ferromagnetic

• Ferroelectric

38.

A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?

• 2 J

• 1 J

• 4 J

• 5 J

A multimeter reads a voltage of a certain AC source as 100 V. What is the peak value of voltage of AC source ?

• 200 V

• 100 V

• 141 V

• 400 V

A senes LCR circuit contains inductance 5 mH, capacitance 2 μF and resistance 10 Ω. If a frequency AC source is varied, what is the frequency at which maximum power is dissipated ?

• $\frac{{10}^5}{\mathrm{\pi }} \mathrm{H}$

• $\frac{{10}^{-5}}{\mathrm{\pi }} \mathrm{Hz}$

• $\frac{2}{\mathrm{\pi }} \times {10}^5 \mathrm{Hz}$

• $\frac{5}{\mathrm{\pi }} \times {10}^3 \mathrm{Hz}$