If electron of velocity 2i^ + 3j^ is subjected to a magnetic field  4k^ , then

1.  Speed will change

2.  Direction will change

3.  Both (1) and (2)

4.  None of the above

Concept Questions :-

Lorentz force
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A long solenoid has 800 turns per meter length of the solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is:

1.  16×10-4 T

2.  8×10-4 T

3.  32×10-4 T

4.  4×10-4 T

Concept Questions :-

Magnetic field due to various cases
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The unit of reduction factor of the tangent galvanometer is 

(1) Ampere

(2) Gauss

(3) Radian

(4) None of these

Concept Questions :-

Moving coil galvanometer
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The resistance of 1 A ammeter is 0.018 Ω. To convert it into 10 A ammeter, the shunt resistance required will be :

(1) 0.18 Ω

(2) 0.0018 Ω

(3) 0.002 Ω

(4) 0.12 Ω

Concept Questions :-

Conversion to ammeter and voltmeter
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In order to pass 10% of the main current through a moving coil galvanometer of 99 ohms, the resistance of the required shunt is :

(1) 9.9 Ω

(2) 10 Ω

(3) 11 Ω

(4) 9 Ω

Concept Questions :-

Conversion to ammeter and voltmeter
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When a 12 Ω resistor is connected in parallel with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is :

(1) 24 Ω

(2) 36 Ω

(3) 48 Ω

(4) 60 Ω

Concept Questions :-

Conversion to ammeter and voltmeter
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A galvanometer can be used as a voltmeter by connecting a :

(1) High resistance in series

(2) Low resistance in series

(3) High resistance in parallel

(4) Low resistance in parallel

Concept Questions :-

Conversion to ammeter and voltmeter
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A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :

(1) nG

(2) (n1)G

(3) Gn 

(4) G(n1)

Concept Questions :-

Conversion to ammeter and voltmeter
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Which of the following statement is wrong:

(1) Voltmeter should have high resistance

(2) Ammeter should have low resistance

(3) Ammeter is placed in parallel across the conductor in a circuit

(4) Voltmeter is placed in parallel across the conductor in a circuit

Concept Questions :-

Conversion to ammeter and voltmeter
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A moving coil galvanometer has a resistance of 50 Ωand gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A :

(1) 50/99 Ω in series

(2) 50/99 Ω in parallel

(3) 0.01 Ω in series

(4) 0.01 Ω in parallel

Concept Questions :-

Conversion to ammeter and voltmeter
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Difficulty Level: