The energy of SHM when particle is at mean position is MCQ with Answer and Explanation

Explanation:
Wave speed v = fλ = 50 × 0.6 = 30 m/s. Basic wave equation. Ensure consistent units: frequency Hz (s⁻¹), wavelength m. Speed of sound 340 m/s in air, this is slower.

Explanation:
Ammeter measures current, must be in series so same current flows through it. Low resistance minimizes circuit disturbance. Voltmeter connects in parallel. Memory aid: 'Ammeter = series (low R); Voltmeter = parallel (high R)'. Circuit connection rule frequently tested in competitive electricity sections.

Explanation:
Inside a long solenoid, magnetic field is uniform (constant magnitude and direction), parallel to the axis, given by B = μ₀nI, where n is turns per unit length. Outside, field is nearly zero. This uniformity makes solenoids useful for creating controlled magnetic fields. Memory tip: 'Solenoid: uniform B inside like bar magnet'. This conceptual question tests knowledge of magnetic field configurations, crucial for electromagnetism in competitive exams. Always distinguish solenoid field (uniform inside) from straight wire field (circular, non-uniform).