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Current sensitivity of a galvanometer can be increased by decreasing?

The current flowing through the coil is proportional to the deflection, or angle of twist, of the suspension. The formula for a galvanometer's... View Article

A closed coil consists of 500 turns on a rectangular frame of the area 4.0cm2 and has a resistance of 500Ω . The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2wb/m2 , the amount of charge flowing through the coil if it is turned over. (Rotate through 1800 ): –

Given parameters are: Number of turns n=500 area A = 4cm2 = 4×10−4m2 resistance R = 500Ω magnetic field B = 0.2wb/m2 We have to calculate... View Article

Moment of inertia does not depend upon A. Angular velocity of the body B. Shape and size C. Mass D. Position of the axis of rotation

Answer: A. Angular velocity of the body The moment of inertia is the quantity that determines how much torque is required for a given angular... View Article

A copper wire of diameter 1.6mm carries a current of 20A. Find the maximum magnitude of the magnetic field B due to this current.

By using the Biot-Savart law B = μ0NI/2R We can find a formula for current carrying straight wire to find the maximum magnetic strength, that... View Article

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed? a) N2 to N₂⁺ b) C₂ to C₂⁺. c) NO to NO⁺ d) O2 to O₂⁺,

Answer: (c) Bond order is the number of chemical bonds between a pair of atoms. A) Bond order reduces from 3 to 2.5 while going from N2 to... View Article

In a LR circuit, R=10Ωand L=2H. If an alternating voltage of 120V and 60Hz is connected in this circuit, then the value current flowing in it will be ____________A

By using Ohm’s law V=IR we can find the value of current flowing in the circuit Here we have the value of potential difference 120V. In LR... View Article

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is:

Work done during expansion of a gas is:- W = −P△V W = −P(Vfinal−Vinitial) W = −3(6−4) W = −6L − atm = −6 ×101.32 = ≈−608J When a free... View Article

For a reaction N2(g) + 3H2 (g) → 2NH3 (g) identify dihydrogen (H2) as a limiting reagent

N2(g) + 3H2(g) → 2NH3(g) In the given reaction, 1 mol of N2 requires 3 moles of H2 for the formation for ammonia. Thus, if the number of moles... View Article

Maximum change in oxidation number of nitrogen is ________ .

Nitrogen is the 7th element in the periodic table. Its electronic configuration is given by, 7N=1s22s22p3 Nitrogen can have oxidation states... View Article

Which of the following changes when a particle is moving with uniform velocity? a) Speed b) Velocity c) Acceleration d) Position vector

Answer: d) Position vector Acceleration =0, Velocity = Speed = constant As the position of particle changes with time so position vector is... View Article

A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope is deviated by an angle of 45∘ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force is? (Assume g=10ms⁻²)

We are given a hanging mass that is pushed by a force at a certain angle. To compute this force when the mass is in equilibrium, we first build... View Article

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will:
a) Change in previous direction b) No change c) Change in opposite direction d) None of these

Answer: (b) No Change There will be no change in deflection because the revised structure is still a wheat stone bridge.A Wheatstone bridge... View Article

The maximum value of the static friction is called limiting friction. (A) True (B) False (C) Ambiguous (D) Data insufficient

Answer: (A) True Friction is the force that prevents solid surfaces, fluid layers, and material components from sliding against each other... View Article

A non-conducting ring of radius R and mass m having charge q uniformly distributed over its circumference is placed on a rough horizontal surface. A vertical time-varying uniform magnetic field B=4t² is switched on at time t=0 . The coefficient of friction between the ring and the table, if the ring starts rotating at t=2s , is:

Let us consider the coefficient of friction to be μ . The ring is placed on a horizontal surface, while the magnetic field is vertical. So, the... View Article

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his hair with his right hand. In how many of the images will he be seen using his right hand: A. 0 B. 1 C. 2 D. 3

Answer: B)1 Two plane mirrors are held at right angles, which implies they are inclined at a 90-degree angle, according to the query. When... View Article

A thin rod of length L is bent to form a semicircle. The mass of the rod is M. What will be the gravitational potential at the center of the circle?

The gravitational potential due to any point mass is given by the formula, ⇒ V = −GM/r, where M is the mass r, is the distance from the... View Article

Gravity separation process is used for the concentration of ______. A) Calamine B) Hematite C) Chalcopyrites D) Bauxite

Answer: b) Hematite The gravity separation technique is used to concentrate ore, as we all know. The gravity separation method is based on... View Article

Which of the following compounds is most reactive towards nucleophilic addition reactions?

a) b) c) d) Answer: (b) Nucleophilic addition reactions are addition reactions that are triggered by a nucleophile, and they are... View Article

A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X

We'll start by assuming that it's been two hours since the first cab left X. Consider one taxi departing from Y at this precise moment; taxis... View Article

A long solenoid is formed by winding 20 turns cm⁻¹. What will be the current necessity to produce a magnetic field of 20mT inside the solenoid (μ04π=10⁻⁷metreAmpere−1)

Consider Ampere’s Law, which is given as ∮ B.dl = μ0Ienc. Due to symmetry, the magnetic field at any point which lies on line CD will be equal,... View Article

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