A particle of charge q and mass m moves with velocity v perpendicular to a uniform magnetic field B. What is the radius of its circular path?
Correct answer D. r = mv/qB
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Everyday Science MCQs
Page 167 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 167 of 198
A current-carrying conductor is placed parallel to a uniform magnetic field. What magnetic force does it experience?
Correct answer B. F = 0
What will a freely suspended current-carrying solenoid do?
Correct answer B. Come to rest in the N-S direction
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A particle of mass m, charge q and speed v enters a uniform magnetic field B and moves in a circle of radius r. How does r depend on these quantities?
Correct answer D. It is directly proportional to m
When is a Wheatstone bridge said to be balanced?
Correct answer C. When the potential difference across the galvanometer branch is zero
What is a galvanometer basically used for?
Correct answer B. To detect current in a circuit
Why is a galvanometer coil placed in a radial magnetic field? The deflecting torque on the coil is then always equal to which expression?
Correct answer D. BINA
A sensitive galvanometer of resistance 50 Ω gives full-scale deflection at 100 mV. What is the maximum current it can safely carry?
Correct answer B. 2.0 mA
In a multi-range ammeter, what happens to the shunt as the range is increased?
Correct answer C. Shunt value decreases
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Which of the following is not an electromechanical instrument?
Correct answer D. AC transformer and DC generator
When the coil of a galvanometer settles in equilibrium, how does the deflecting couple compare with the restoring couple?
Correct answer C. It equals the restoring couple
Which instrument can measure potential difference without drawing any current?
Correct answer D. Cathode ray oscilloscope (CRO)
An electron enters a region where an electric field E is perpendicular to a magnetic field B. Under what condition does it pass through undeflected?
Correct answer B. E = Bv
Which symbol is conventionally used for the magnetic flux density vector?
Correct answer D. B
What is the SI unit of magnetic flux density?
Correct answer B. N A⁻¹ m⁻¹
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How is the tesla related to the smaller unit of magnetic induction, the gauss?
Correct answer C. 1 T = 10⁴ G
Which material is best suited for the core of an electromagnet?
Correct answer A. Soft iron
Which statement about a magnetic field and a charged particle is correct?
Correct answer A. It exerts a force if the charged particle is moving perpendicular to the magnetic field lines
What happens to two parallel wires carrying currents in opposite directions?
Correct answer C. They repel each other
A 10 cm wire lies at right angles to a uniform magnetic field of 0.5 Wb/m², and the force on it is 5 N. What current flows in the wire?
Correct answer B. 100 A