Unlike poles of ………… magnet each other.
A) attract
B) repel
C) both
D) none of these
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The tendency of bonded atom to attract the electron pair towards itself is……………
B) electronegativity
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i. Lenses are kept in contact with each other ii. Two lenses kept at a distance d apart from each other.
i when lenses are kept in contact then 1/f = 1/f1 + 1/f2 f = f1f2 / f1 + f2 ii. When kept distant apart, 1/f = 1/f1 +1/f2 - d/f1f2
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A bar magnet of magnetic moment 5.0 Am^2 has the poles 20 cm apart. Calculate the pole strength.
Given: m = 5.0 Am2, 2l = 20 cm = 0.20 m To find: Pole strength (qm) Formula: qm = \(\frac{m}{2l}\) Calculation: From formula. qm = \(\frac{5.0}{0.20}\) = 25 Am
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A bar magnet is cut into two equal parts vertically and half part of bar magnet is kept on the other such that opposite poles align each other.
When bar magnet is cut into two equal parts, then magnetic moment of each part becomes half of the original directed from S to N pole. ∴ Magnetic moment of the combination...
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A person sitting in a satellite feels weightlessness because A) the earth does not attract the objects in a satellite.
C) the normal force is zero
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Which of the following attract insects for pollination?
The correct answer is A) Petals
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Assertion (A): Magnetic force is a field force. Reason (R): A magnet can attract or repel another magnet with zero magnitude.
C) A is true, but R is false
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Like poles of ………… magnet each other. A) attract
Correct option is B) repel
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Like poles of ………… magnet each other. A) attract
2 Answers
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A short bar magnet of magnetic moment `20Am^(2)` has a cross sectional area of `1.5xx10^(-4)m^(2)`. If the intensity of magnetisation of the magnet is
Correct Answer - C `I=(M)/(V)=(m)/(A)`
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