Electromagnetism Mcqs
Our collections of Multiple choice questions and answers focuses on study of Electromagnetism in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Electromagnetism in Physics comprehensively.
2. A galvanometer basically is an instrument used to
Detect current in a circuit
Measure current flowing through a circuit
Measure voltage across a circuit
Measure potential difference between two points in a circuit
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3. A magnetic compass will be deflected if it is kept near a
Charge in motion
Charge at rest
Both
None
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4. A magnetic field
Always exerts a force on a charged particle
Never exerts a force on a charged particles
Exerts a force if the charged particle is moving in the direction of the magnetic field lines
Exerts a force if the charged particle is moving perpendicular to the magnetic field lines
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5. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it?
4 volt
5 volt
2 volt
0.4 volt
6. A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is
Independent mass m
Directly proportional to m
Directly proportional to q
Directly proportional to B
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7. A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is
2.0 mA
20 mA
200 mA
0.2 mA
8. A wheat stone bridge is said to be balanced when
Maximum current flows through the galvanometer branch
Minimum current flows through the galvanometer branch
Potential difference across galvanometer branch is maximum
Potential difference across galvanometer branch is zero
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9. An ammeter measures the total current flowing through a circuit when it is connected
In series with the circuit
In parallel with circuit
In series with any of the parallel resistances in the circuit
In parallel with any of the series resistances in the circuit
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10. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if
E = BeV
B = eE/V
E = BV
E = BeV/2
11. An instrument which can measure potential without drawing any current is
Voltmeter
Galvanometer
Cathode ray oscilloscope (CRO)
Ammeter
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12. Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always
BINA cosa
BINA sina
BINA tana
BINA
13. Galvanometer is a very sensitive device with
Very low damping
Very high damping
No damping at all
Radial field disintegration
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14. Heating a magnet will
Weaken it
Strengthen it
Reverse its polarity
Demagnetize it completely
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15. If a current carrying solenoid is suspended freely it will
Be rotating
Come to rest in N-S direction
Vibrating like galvanometer needle
Comes to rest after rotation
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