Question 41 : The magnetic field strength of a solenoid can be increased by inserting which of the following materials as the core?
1. Copper
2. Silver
3. Iron
4. Aluminium
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Question 42 : If length of current carrying conductor increases, what is the effect on the force?
1. increases
2. decreases
3. remain same
4. become zero
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Question 43 : If current of conductor increases, what is the effect on the force?
1. increases
2. decreases
3. remain same
4. become zero
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Question 44 : The force per unit length existing between two infinite parallel conductors is given by ___________
1. µ₀i₁i₂/2pd
2. µ₀i₁i₂/2d
3. µ₀i₁/2pdi₂
4. µ₀i₁i₂/d
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Question 45 : Magnetic field at a point d distance away from long wire due to electric current i in it is ____________
1. µ₀i/2r
2. µ₀i/r
3. µ₀i/2pr
4. µ₀i/pr
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Question 46 : When the distance of operation between the two conductors increases, what happens to the force between the two conductors?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 47 : The force existing between two infinite parallel conductors is inversely proportional to ________
1. Radius of the conductors
2. Current in one of the conductors
3. The product of the current in the two conductors
4. The distance between the two conductors
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Question 48 : Magnetic field is strong when____________
1. magnetic field lines are closer
2. magnetic field lines are farther
3. magnetic field lines are longer
4. magnetic field lines are thicker
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Question 49 : More the number of magnetic flux lines _______ is the force of the magnet.
1. Greater
2. Lesser
3. Either greater or lesser
4. Neither greater nor lesser
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Question 50 : Lines of magnetic flux which are parallel and in the same direction __________ each other.
1. Attract
2. Repel
3. Intersect
4. Cancel
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